Prototype - Object isNumber() 方法
如果 obj 是数字类型,则此方法返回 true,否则返回 false。
语法
Object.isNumber(obj);
返回值
如果 obj 是数字类型,则返回 true,否则返回 false。
示例
<html>
<head>
<title>Prototype examples</title>
<script type = "text/javascript" src = "/javascript/prototype.js"></script>
<script>
function showResult() {
var myNumber = 100;
alert( "test 1: " + Object.isNumber(0) );
alert( "test 2: " + Object.isNumber(1.2) );
alert( "test 3: " + Object.isNumber("foo") );
alert( "test 4: " + Object.isNumber(myNumber) );
}
</script>
</head>
<body>
<p>单击按钮查看结果。</p>
<br />
<br />
<input type = "button" value = "Result" onclick = "showResult();"/>
</body>
</html>

prototype_basic_object.html