Canvas画刮刮乐 - 码农教程

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        #out{
            border: 1px solid #ccc;
            position: absolute;
            z-index: 999;
        }
        #con{
            position: absolute;
            height: 100px;
            width: 200px;
            line-height: 100px;
            text-align: center;
            font-size: 25px;
        }
    </style>
</head>
<body>
        <canvas id="out" width="200" height="100"></canvas>
        <div id="con"></div>
</body>
<script>
     var cvs = document.getElementById("out")
     var con = document.getElementById("con")
     
     var arr = ["别墅","100w","谢谢惠顾"]
     var i = Math.floor(Math.random()*arr.length)
     con.innerHTML = arr[i]

     var ctx = cvs.getContext("2d");
     ctx.beginPath() 
    ctx.fillStyle="#ccc"
    ctx.fillRect(0,0,cvs.width,cvs.height)
    ctx.closePath()

    cvs.onmousedown = function(){
        document.onmousemove=function(e){
            ctx.clearRect(e.clientX-cvs.offsetLeft,e.clientY-cvs.offsetTop,20,20)
        }
        document.onmouseup=function(){
            document.onmousedown = null;
            document.onmousemove=null;
        }
    }


</script>
</html>