ES02 变量、数组、对象、方法

1 变量

　　1.1 变量的声明

　　　　利用var关键字来声明变量，例如：

    var a = 100;

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>JavaScriptTest</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">

<!-- <script src="/js/jquery.js"></script> -->
<script src="http://cdn.static.runoob.com/libs/jquery/2.0.0/jquery.min.js"></script>
<script>
    var a = 100;
    function test01() {
        alert("变量a的值为：" + a);
    }
</script>
    
</head>
<body>
    <p id="testP">Hello Boy</p>
    
    <button id="test" onClick="test01()">测试按钮</button><br />

    <script>
    
    </script>

    
</body>
</html>

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