妙味——JS学前预热03

（1）代码效果：

　　主要是学习　　函数

（2）实现代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
<style>
    #div{width: 100px;height: 100px;background: orange;}
</style>
</head>
<body>
    <div id="div" onmouseover="document.getElementById('div').style.width='200px';document.getElementById('div').style.height='200px';document.getElementById('div').style.background='green';" onmouseout="document.getElementById('div').style.width='100px';document.getElementById('div').style.height='100px';document.getElementById('div').style.background='orange';" ></div>
</body>
</html>

。。。。。<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
<style>
    #div{width: 100px;height: 100px;background: orange;}
</style>
<script>
    function toGreen(){
        document.getElementById('div').style.width='200px';
        document.getElementById('div').style.height='200px';
        document.getElementById('div').style.background='green';
    }

    function toRed(){
        document.getElementById('div').style.width='100px';
        document.getElementById('div').style.height='100px';
        document.getElementById('div').style.background='orange'; 
    }
</script>
</head>
<body>
    <div id="div" onmouseover="toGreen()" onmouseout="toRed()"></div>
</body>
</html>


/////////优化后的JS代码如下所示：/////////

<script>
    function toGreen(){
        var oDiv = document.getElementById('div');

        oDiv.style.width='200px';
        oDiv.style.height='200px';
        oDiv.style.background='green';
    }

    function toRed(){
        var oDiv = document.getElementById('div');

        oDiv.style.width='100px';
        oDiv.style.height='100px';
        oDiv.style.background='orange'; 
    }
</script>

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