retrofit 源码分析
时间:2022-06-10
本文章向大家介绍retrofit 源码分析,主要内容包括其使用实例、应用技巧、基本知识点总结和需要注意事项,具有一定的参考价值,需要的朋友可以参考一下。
retrofit
的初始化
private static Retrofit RETROFIT;
private static Retrofit getRetrofit() {
if (RETROFIT == null) {
RETROFIT = new Retrofit.Builder()
.client(getHttpClient())
.baseUrl(BuildConfig.SERVER_URL)
.addConverterFactory(NobodyConverterFactory.create())
.addConverterFactory(GsonConverterFactory.create(new GsonBuilder()
.registerTypeAdapter(new TypeToken<HashMap<String, Object>>() {
}.getType(), new MapTypeAdapter()).create()))
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.build();
}
return RETROFIT;
}
static OkHttpClient getHttpClient() {
return new OkHttpClient.Builder()
.connectTimeout(15, TimeUnit.SECONDS)
.readTimeout(15, TimeUnit.SECONDS)
.writeTimeout(15, TimeUnit.SECONDS)
.retryOnConnectionFailure(true)
.addInterceptor(AccessTokenInterceptor.getInstance())
.addInterceptor(new RefreshTokenInterceptor(
BuildConfig.SERVER_URL))
.addInterceptor(new ErrorPreviewInterceptor())
.addInterceptor(new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() {
@Override
public void log(String message) {
LogUtils.i(TAG, message);
}
}).setLevel(HttpLoggingInterceptor
.Level.BODY))
.build();
}
Refofit.Builder: 初始化过程
/**
* Build a new {@link Retrofit}.
* <p>
* Calling {@link #baseUrl} is required before calling {@link #build()}. All other methods
* are optional.
*/
public static final class Builder {
//平台 android? java8? ios?
private final Platform platform;
//ok3网络请求Factory
private okhttp3.Call.Factory callFactory;
// host
private HttpUrl baseUrl;
// 数据转换器 request和responseBody解析器 string -->gson-->T
private final List<Converter.Factory> converterFactories = new ArrayList<>();
// ok3返回的 response 转换器 response--> rxjava对象
private final List<CallAdapter.Factory> adapterFactories = new ArrayList<>();
//线程调度
private Executor callbackExecutor;
//如果设置为true 在service create的时候就先把方法参数解析出来加入缓存
//设置为false 在调用这个函数的时候在加入缓存
private boolean validateEagerly;
Builder(Platform platform) {
this.platform = platform;
// Add the built-in converter factory first. This prevents overriding its behavior but also
// ensures correct behavior when using converters that consume all types.
converterFactories.add(new BuiltInConverters());
}
public Builder() {
this(Platform.get());
}
Builder(Retrofit retrofit) {
platform = Platform.get();
callFactory = retrofit.callFactory;
baseUrl = retrofit.baseUrl;
converterFactories.addAll(retrofit.converterFactories);
adapterFactories.addAll(retrofit.adapterFactories);
// Remove the default, platform-aware call adapter added by build().
adapterFactories.remove(adapterFactories.size() - 1);
callbackExecutor = retrofit.callbackExecutor;
validateEagerly = retrofit.validateEagerly;
}
/**
* Create the {@link Retrofit} instance using the configured values.
* <p>
* Note: If neither {@link #client} nor {@link #callFactory} is called a default {@link
* OkHttpClient} will be created and used.
*/
public Retrofit build() {
if (baseUrl == null) {
throw new IllegalStateException("Base URL required.");
}
okhttp3.Call.Factory callFactory = this.callFactory;
if (callFactory == null) {
callFactory = new OkHttpClient();
}
Executor callbackExecutor = this.callbackExecutor;
if (callbackExecutor == null) {
callbackExecutor = platform.defaultCallbackExecutor();
}
// Make a defensive copy of the adapters and add the default Call adapter.
List<CallAdapter.Factory> adapterFactories = new ArrayList<>(this.adapterFactories);
adapterFactories.add(platform.defaultCallAdapterFactory(callbackExecutor));
// Make a defensive copy of the converters.
List<Converter.Factory> converterFactories = new ArrayList<>(this.converterFactories);
return new Retrofit(callFactory, baseUrl, converterFactories, adapterFactories,
callbackExecutor, validateEagerly);
}
}
create
public <T> T create(final Class<T> service) {
Utils.validateServiceInterface(service);
if (validateEagerly) {
eagerlyValidateMethods(service);
}
//动态代理
return (T) Proxy.newProxyInstance(service.getClassLoader(), new Class<?>[] { service },
new InvocationHandler() {
//Android
private final Platform platform = Platform.get();
@Override public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
// If the method is a method from Object then defer to normal invocation.
//如果是object的函数 直接执行
if (method.getDeclaringClass() == Object.class) {
return method.invoke(this, args);
}
//如果是platform的默认函数 预留的一个钩子
if (platform.isDefaultMethod(method)) {
return platform.invokeDefaultMethod(method, service, proxy, args);
}
//加载service的方法
ServiceMethod<Object, Object> serviceMethod =
(ServiceMethod<Object, Object>) loadServiceMethod(method);
//根据ServiceMethod得到ok3的网络请求call
OkHttpCall<Object> okHttpCall = new OkHttpCall<>(serviceMethod, args);
//网络请求 数据转换 返回数据
return serviceMethod.callAdapter.adapt(okHttpCall);
}
});
}
loadServiceMethod: 拿到对应的解析器,根据注解解析方法的返回类型,方法参数,网络请求的一系列参数 封装成一个对象
ServiceMethod<?, ?> loadServiceMethod(Method method) {
// 读缓存
ServiceMethod<?, ?> result = serviceMethodCache.get(method);
if (result != null) return result;
synchronized (serviceMethodCache) {
result = serviceMethodCache.get(method);
if (result == null) {
//得到ServiceMethod对象
result = new ServiceMethod.Builder<>(this, method).build();
//加入缓存
serviceMethodCache.put(method, result);
}
}
return result;
}
ServiceMethod:
Builder(Retrofit retrofit, Method method) {
this.retrofit = retrofit;
this.method = method;
this.methodAnnotations = method.getAnnotations();
this.parameterTypes = method.getGenericParameterTypes();
this.parameterAnnotationsArray = method.getParameterAnnotations();
}
public ServiceMethod build() {
//根据返回类型以及retrofit的adapterFactories拿到callAdapter解析器
callAdapter = createCallAdapter();
//解析之后的类型
responseType = callAdapter.responseType();
if (responseType == Response.class || responseType == okhttp3.Response.class) {
throw methodError("'"
+ Utils.getRawType(responseType).getName()
+ "' is not a valid response body type. Did you mean ResponseBody?");
}
//根据responseType通过retrofit的converterFactories拿到 responseBody解析器
responseConverter = createResponseConverter();
//后面都是解析注解 拼接参数
for (Annotation annotation : methodAnnotations) {
parseMethodAnnotation(annotation);
}
if (httpMethod == null) {
throw methodError("HTTP method annotation is required (e.g., @GET, @POST, etc.).");
}
if (!hasBody) {
if (isMultipart) {
throw methodError(
"Multipart can only be specified on HTTP methods with request body (e.g., @POST).");
}
if (isFormEncoded) {
throw methodError("FormUrlEncoded can only be specified on HTTP methods with "
+ "request body (e.g., @POST).");
}
}
int parameterCount = parameterAnnotationsArray.length;
parameterHandlers = new ParameterHandler<?>[parameterCount];
for (int p = 0; p < parameterCount; p++) {
Type parameterType = parameterTypes[p];
if (Utils.hasUnresolvableType(parameterType)) {
throw parameterError(p, "Parameter type must not include a type variable or wildcard: %s",
parameterType);
}
Annotation[] parameterAnnotations = parameterAnnotationsArray[p];
if (parameterAnnotations == null) {
throw parameterError(p, "No Retrofit annotation found.");
}
parameterHandlers[p] = parseParameter(p, parameterType, parameterAnnotations);
}
if (relativeUrl == null && !gotUrl) {
throw methodError("Missing either @%s URL or @Url parameter.", httpMethod);
}
if (!isFormEncoded && !isMultipart && !hasBody && gotBody) {
throw methodError("Non-body HTTP method cannot contain @Body.");
}
if (isFormEncoded && !gotField) {
throw methodError("Form-encoded method must contain at least one @Field.");
}
if (isMultipart && !gotPart) {
throw methodError("Multipart method must contain at least one @Part.");
}
return new ServiceMethod<>(this);
}
OkHttpCall:是一个ok3的call ,用于网络请求
/*
* Copyright (C) 2015 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package retrofit2;
import java.io.IOException;
import okhttp3.MediaType;
import okhttp3.Request;
import okhttp3.ResponseBody;
import okio.Buffer;
import okio.BufferedSource;
import okio.ForwardingSource;
import okio.Okio;
final class OkHttpCall<T> implements Call<T> {
private final ServiceMethod<T, ?> serviceMethod;
private final Object[] args;
private volatile boolean canceled;
// All guarded by this.
private okhttp3.Call rawCall;
private Throwable creationFailure; // Either a RuntimeException or IOException.
private boolean executed;
OkHttpCall(ServiceMethod<T, ?> serviceMethod, Object[] args) {
this.serviceMethod = serviceMethod;
this.args = args;
}
@SuppressWarnings("CloneDoesntCallSuperClone") // We are a final type & this saves clearing state.
@Override public OkHttpCall<T> clone() {
return new OkHttpCall<>(serviceMethod, args);
}
//请求
@Override public synchronized Request request() {
okhttp3.Call call = rawCall;
if (call != null) {
return call.request();
}
if (creationFailure != null) {
if (creationFailure instanceof IOException) {
throw new RuntimeException("Unable to create request.", creationFailure);
} else {
throw (RuntimeException) creationFailure;
}
}
try {
return (rawCall = createRawCall()).request();
} catch (RuntimeException e) {
creationFailure = e;
throw e;
} catch (IOException e) {
creationFailure = e;
throw new RuntimeException("Unable to create request.", e);
}
}
//异步请求
@Override public void enqueue(final Callback<T> callback) {
if (callback == null) throw new NullPointerException("callback == null");
okhttp3.Call call;
Throwable failure;
synchronized (this) {
if (executed) throw new IllegalStateException("Already executed.");
executed = true;
call = rawCall;
failure = creationFailure;
if (call == null && failure == null) {
try {
call = rawCall = createRawCall();
} catch (Throwable t) {
failure = creationFailure = t;
}
}
}
if (failure != null) {
callback.onFailure(this, failure);
return;
}
if (canceled) {
call.cancel();
}
call.enqueue(new okhttp3.Callback() {
@Override public void onResponse(okhttp3.Call call, okhttp3.Response rawResponse)
throws IOException {
Response<T> response;
try {
response = parseResponse(rawResponse);
} catch (Throwable e) {
callFailure(e);
return;
}
callSuccess(response);
}
@Override public void onFailure(okhttp3.Call call, IOException e) {
try {
callback.onFailure(OkHttpCall.this, e);
} catch (Throwable t) {
t.printStackTrace();
}
}
private void callFailure(Throwable e) {
try {
callback.onFailure(OkHttpCall.this, e);
} catch (Throwable t) {
t.printStackTrace();
}
}
private void callSuccess(Response<T> response) {
try {
callback.onResponse(OkHttpCall.this, response);
} catch (Throwable t) {
t.printStackTrace();
}
}
});
}
@Override public synchronized boolean isExecuted() {
return executed;
}
@Override public Response<T> execute() throws IOException {
okhttp3.Call call;
synchronized (this) {
if (executed) throw new IllegalStateException("Already executed.");
executed = true;
if (creationFailure != null) {
if (creationFailure instanceof IOException) {
throw (IOException) creationFailure;
} else {
throw (RuntimeException) creationFailure;
}
}
call = rawCall;
if (call == null) {
try {
call = rawCall = createRawCall();
} catch (IOException | RuntimeException e) {
creationFailure = e;
throw e;
}
}
}
if (canceled) {
call.cancel();
}
return parseResponse(call.execute());
}
//创建realCall ok3的
private okhttp3.Call createRawCall() throws IOException {
//组装参数
Request request = serviceMethod.toRequest(args);
okhttp3.Call call = serviceMethod.callFactory.newCall(request);
if (call == null) {
throw new NullPointerException("Call.Factory returned null.");
}
return call;
}
//解析response
Response<T> parseResponse(okhttp3.Response rawResponse) throws IOException {
ResponseBody rawBody = rawResponse.body();
// Remove the body's source (the only stateful object) so we can pass the response along.
rawResponse = rawResponse.newBuilder()
.body(new NoContentResponseBody(rawBody.contentType(), rawBody.contentLength()))
.build();
int code = rawResponse.code();
if (code < 200 || code >= 300) {
try {
// Buffer the entire body to avoid future I/O.
ResponseBody bufferedBody = Utils.buffer(rawBody);
return Response.error(bufferedBody, rawResponse);
} finally {
rawBody.close();
}
}
if (code == 204 || code == 205) {
rawBody.close();
return Response.success(null, rawResponse);
}
ExceptionCatchingRequestBody catchingBody = new ExceptionCatchingRequestBody(rawBody);
try {
//通过response解析器进行类型转换
T body = serviceMethod.toResponse(catchingBody);
return Response.success(body, rawResponse);
} catch (RuntimeException e) {
// If the underlying source threw an exception, propagate that rather than indicating it was
// a runtime exception.
catchingBody.throwIfCaught();
throw e;
}
}
public void cancel() {
canceled = true;
okhttp3.Call call;
synchronized (this) {
call = rawCall;
}
if (call != null) {
call.cancel();
}
}
@Override public boolean isCanceled() {
if (canceled) {
return true;
}
synchronized (this) {
return rawCall != null && rawCall.isCanceled();
}
}
static final class NoContentResponseBody extends ResponseBody {
private final MediaType contentType;
private final long contentLength;
NoContentResponseBody(MediaType contentType, long contentLength) {
this.contentType = contentType;
this.contentLength = contentLength;
}
@Override public MediaType contentType() {
return contentType;
}
@Override public long contentLength() {
return contentLength;
}
@Override public BufferedSource source() {
throw new IllegalStateException("Cannot read raw response body of a converted body.");
}
}
static final class ExceptionCatchingRequestBody extends ResponseBody {
private final ResponseBody delegate;
IOException thrownException;
ExceptionCatchingRequestBody(ResponseBody delegate) {
this.delegate = delegate;
}
@Override public MediaType contentType() {
return delegate.contentType();
}
@Override public long contentLength() {
return delegate.contentLength();
}
@Override public BufferedSource source() {
return Okio.buffer(new ForwardingSource(delegate.source()) {
@Override public long read(Buffer sink, long byteCount) throws IOException {
try {
return super.read(sink, byteCount);
} catch (IOException e) {
thrownException = e;
throw e;
}
}
});
}
@Override public void close() {
delegate.close();
}
void throwIfCaught() throws IOException {
if (thrownException != null) {
throw thrownException;
}
}
}
}
CallAdapter的选择:ServiceMethon.createCallAdapter()–>retrofit.callAdapter() –>retrofit.nextCallAdapter() –>adapterFactories.get();
/**
* Returns the {@link CallAdapter} for {@code returnType} from the available {@linkplain
* #callAdapterFactories() factories} except {@code skipPast}.
*
* @throws IllegalArgumentException if no call adapter available for {@code type}.
*/
public CallAdapter<?, ?> nextCallAdapter(CallAdapter.Factory skipPast, Type returnType,
Annotation[] annotations) {
checkNotNull(returnType, "returnType == null");
checkNotNull(annotations, "annotations == null");
int start = adapterFactories.indexOf(skipPast) + 1;
for (int i = start, count = adapterFactories.size(); i < count; i++) {
CallAdapter<?, ?> adapter = adapterFactories.get(i).get(returnType, annotations, this);
if (adapter != null) {
return adapter;
}
}
StringBuilder builder = new StringBuilder("Could not locate call adapter for ")
.append(returnType)
.append(".n");
if (skipPast != null) {
builder.append(" Skipped:");
for (int i = 0; i < start; i++) {
builder.append("n * ").append(adapterFactories.get(i).getClass().getName());
}
builder.append('n');
}
builder.append(" Tried:");
for (int i = start, count = adapterFactories.size(); i < count; i++) {
builder.append("n * ").append(adapterFactories.get(i).getClass().getName());
}
throw new IllegalArgumentException(builder.toString());
}
看看RxJava2CallAdapterFactory
的get
函数,拿到属于自己的RxJava2CallAdapter
@Override
public CallAdapter<?, ?> get(Type returnType, Annotation[] annotations, Retrofit retrofit) {
Class<?> rawType = getRawType(returnType);
if (rawType == Completable.class) {
// Completable is not parameterized (which is what the rest of this method deals with) so it
// can only be created with a single configuration.
return new RxJava2CallAdapter(Void.class, scheduler, isAsync, false, true, false, false,
false, true);
}
boolean isFlowable = rawType == Flowable.class;
boolean isSingle = rawType == Single.class;
boolean isMaybe = rawType == Maybe.class;
if (rawType != Observable.class && !isFlowable && !isSingle && !isMaybe) {
return null;
}
boolean isResult = false;
boolean isBody = false;
Type responseType;
if (!(returnType instanceof ParameterizedType)) {
String name = isFlowable ? "Flowable"
: isSingle ? "Single"
: isMaybe ? "Maybe" : "Observable";
throw new IllegalStateException(name + " return type must be parameterized"
+ " as " + name + "<Foo> or " + name + "<? extends Foo>");
}
Type observableType = getParameterUpperBound(0, (ParameterizedType) returnType);
Class<?> rawObservableType = getRawType(observableType);
if (rawObservableType == Response.class) {
if (!(observableType instanceof ParameterizedType)) {
throw new IllegalStateException("Response must be parameterized"
+ " as Response<Foo> or Response<? extends Foo>");
}
responseType = getParameterUpperBound(0, (ParameterizedType) observableType);
} else if (rawObservableType == Result.class) {
if (!(observableType instanceof ParameterizedType)) {
throw new IllegalStateException("Result must be parameterized"
+ " as Result<Foo> or Result<? extends Foo>");
}
responseType = getParameterUpperBound(0, (ParameterizedType) observableType);
isResult = true;
} else {
responseType = observableType;
isBody = true;
}
return new RxJava2CallAdapter(responseType, scheduler, isAsync, isResult, isBody, isFlowable,
isSingle, isMaybe, false);
}
我们在拿到ok3的response之后转换为我们需要的类型通过callAdapter的adapter函数,看下RxJava2CallAdapter
@Override public Object adapt(Call<R> call) {
Observable<Response<R>> responseObservable = isAsync
? new CallEnqueueObservable<>(call)
: new CallExecuteObservable<>(call);
Observable<?> observable;
if (isResult) {
observable = new ResultObservable<>(responseObservable);
} else if (isBody) {
observable = new BodyObservable<>(responseObservable);
} else {
observable = responseObservable;
}
if (scheduler != null) {
observable = observable.subscribeOn(scheduler);
}
if (isFlowable) {
return observable.toFlowable(BackpressureStrategy.LATEST);
}
if (isSingle) {
return observable.singleOrError();
}
if (isMaybe) {
return observable.singleElement();
}
if (isCompletable) {
return observable.ignoreElements();
}
return observable;
}
解析看responseConverter,ServiceMthon.createResponseConverter()–>retrofit.responseBodyConverter–>retrofit.nextResponseBodyConverter()
/**
* Returns a {@link Converter} for {@link ResponseBody} to {@code type} from the available
* {@linkplain #converterFactories() factories} except {@code skipPast}.
*
* @throws IllegalArgumentException if no converter available for {@code type}.
*/
public <T> Converter<ResponseBody, T> nextResponseBodyConverter(Converter.Factory skipPast,
Type type, Annotation[] annotations) {
checkNotNull(type, "type == null");
checkNotNull(annotations, "annotations == null");
int start = converterFactories.indexOf(skipPast) + 1;
for (int i = start, count = converterFactories.size(); i < count; i++) {
Converter<ResponseBody, ?> converter =
converterFactories.get(i).responseBodyConverter(type, annotations, this);
if (converter != null) {
//noinspection unchecked
return (Converter<ResponseBody, T>) converter;
}
}
StringBuilder builder = new StringBuilder("Could not locate ResponseBody converter for ")
.append(type)
.append(".n");
if (skipPast != null) {
builder.append(" Skipped:");
for (int i = 0; i < start; i++) {
builder.append("n * ").append(converterFactories.get(i).getClass().getName());
}
builder.append('n');
}
builder.append(" Tried:");
for (int i = start, count = converterFactories.size(); i < count; i++) {
builder.append("n * ").append(converterFactories.get(i).getClass().getName());
}
throw new IllegalArgumentException(builder.toString());
}
看看GsonConverterFactory
/**
* A {@linkplain Converter.Factory converter} which uses Gson for JSON.
* <p>
* Because Gson is so flexible in the types it supports, this converter assumes that it can handle
* all types. If you are mixing JSON serialization with something else (such as protocol buffers),
* you must {@linkplain Retrofit.Builder#addConverterFactory(Converter.Factory) add this instance}
* last to allow the other converters a chance to see their types.
*/
public final class GsonConverterFactory extends Converter.Factory {
/**
* Create an instance using a default {@link Gson} instance for conversion. Encoding to JSON and
* decoding from JSON (when no charset is specified by a header) will use UTF-8.
*/
public static GsonConverterFactory create() {
return create(new Gson());
}
/**
* Create an instance using {@code gson} for conversion. Encoding to JSON and
* decoding from JSON (when no charset is specified by a header) will use UTF-8.
*/
public static GsonConverterFactory create(Gson gson) {
return new GsonConverterFactory(gson);
}
private final Gson gson;
private GsonConverterFactory(Gson gson) {
if (gson == null) throw new NullPointerException("gson == null");
this.gson = gson;
}
@Override
public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations,
Retrofit retrofit) {
TypeAdapter<?> adapter = gson.getAdapter(TypeToken.get(type));
return new GsonResponseBodyConverter<>(gson, adapter);
}
@Override
public Converter<?, RequestBody> requestBodyConverter(Type type,
Annotation[] parameterAnnotations, Annotation[] methodAnnotations, Retrofit retrofit) {
TypeAdapter<?> adapter = gson.getAdapter(TypeToken.get(type));
return new GsonRequestBodyConverter<>(gson, adapter);
}
}
通过工程得到GsonResponseBodyConverter
import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import java.io.IOException;
import okhttp3.ResponseBody;
import retrofit2.Converter;
final class GsonResponseBodyConverter<T> implements Converter<ResponseBody, T> {
private final Gson gson;
private final TypeAdapter<T> adapter;
GsonResponseBodyConverter(Gson gson, TypeAdapter<T> adapter) {
this.gson = gson;
this.adapter = adapter;
}
@Override public T convert(ResponseBody value) throws IOException {
JsonReader jsonReader = gson.newJsonReader(value.charStream());
try {
return adapter.read(jsonReader);
} finally {
value.close();
}
}
}
当然请求和GsonResponseBodyConverter类似,也是通过工厂来生成。
总结:
- 动态代理实现接口函数调用的拦截
- 通过返回类型来和
CallAdapter.Factory
遍历对比调用get函数拿到对应于的callAdapter
,然后通过callAdapter.adapter
函数来进行数据转换 - 通过返回类型来和
Converter.Factory
遍历对比调用responseBodyConverter
和requestBodyConverter
函数拿到对应于的Converter
,然后通过Converter.conver
t函数来进行请求数据或者responseBody
的数据转换 - 参数解析的时候判断很多,根据你的参数不同实例不同的
ParameterHandler
,请求的时候通过ParameterHandler
组装数据
参考链接: retrofit源码
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- Javascript 跳转语句
- Javascript 控制语句总结
- Javascript 函数介绍
- Javascript 函数的定义
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- Javascript isNaN() 函数
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- Javascript 字符串介绍
- Javascript length属性
- javascript 字符串函数
- Javascript 日期对象简介
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- Date 对象属性和方法
- Javascript 数组是什么
- Javascript 创建数组
- Javascript 数组赋值与取值
- Javascript 数组属性和方法
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