flash的前端解决方案

function flashChecker() {
        var hasFlash = 0; //是否安装了flash
        var flashVersion = 0; //flash版本
        var isValid = 0; //是否过期

        //IE浏览器
        if ("ActiveXObject" in window) {
            try {
                var swf = new ActiveXObject("ShockwaveFlash.ShockwaveFlash");
                hasFlash = 1;
                isValid = 1;
                VSwf = swf.GetVariable("$version");
                flashVersion = parseInt(VSwf.split(" ")[1].split(",")[0]);
            } catch (e) {}
        //非IE浏览器
        } else {
            try {
                if (navigator.plugins && navigator.plugins.length > 0) {
                    var swf = navigator.plugins["Shockwave Flash"];
                    if (swf) {
                        hasFlash = 1;
                        isValid = 1;
                        var words = swf.description.split(" ");
                        for (var i = 0; i < words.length; ++i) {
                            if (isNaN(parseInt(words[i]))) continue;
                            flashVersion = parseInt(words[i]);
                        }
                        if(swf.filename && swf.filename == 'internal-not-yet-present'){ //过期
                            isValid = 0;
                        }
                    }
                }
            } catch (e) {}
        }
        return { flash: hasFlash, version: flashVersion, vaild: isValid };
    }