利用div+css实现九宫格，然后用js实现点击每个格子可以随机更改格子(div)的背景颜色

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>div+css+js实现九宫格点击随机变色</title>
    <script>
        var inner = document.getElementsByClassName("inner");
        function ChangeColor(num){
            var a = parseInt(Math.random()*10);
            var b = parseInt(Math.random()*10);
            var c = parseInt(Math.random()*10);
            var d = parseInt(Math.random()*10);
            var e = parseInt(Math.random()*10);
            var f = parseInt(Math.random()*10);
            var g = "#"+a+b+c+d+e+f;
            inner[num].style.backgroundColor=g;
//            log.innerHTML=g;
//            inner[num].style.backgroundColor="rgb("+parseInt(Math.random()*255)+","+parseInt
//            (Math.random()*255)+","+parseInt(Math.random()*255)+")";
        }
    </script>
    <style>
        #outer{
            width:306px;
        }
        #outer div{
            height:100px;
            width:100px;
            background-color: #ff00ff;
            float: left;
            line-height:100px;
            text-align: center;
            margin-left:2px;
            margin-top:2px;
        }
    </style>
</head>
<body>
<div id="outer">
    <div class="inner" onclick="ChangeColor('0')">1</div>
    <div class="inner" onclick="ChangeColor('1')">2</div>
    <div class="inner" onclick="ChangeColor('2')">3</div>
    <div class="inner" onclick="ChangeColor('3')">4</div>
    <div class="inner" onclick="ChangeColor('4')">5</div>
    <div class="inner" onclick="ChangeColor('5')">6</div>
    <div class="inner" onclick="ChangeColor('6')">7</div>
    <div class="inner" onclick="ChangeColor('7')">8</div>
    <div class="inner" onclick="ChangeColor('8')">9</div>
</div>
<div id="log"></div>
</body>
</html>

利用div+css实现九宫格，然后用js实现点击每个格子可以随机更改格子(div)的背景颜色

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