1 判断是否为数组类型2 判断是否为字符串类型3 判断是否为数值类型4 判断是否为日期类型5 判断是否为函数6 判断是否为对象1 判断是否为数组类型linenum<script type="text/javascript">//<![CDATA[var a=[0];document.write(isArray(a),‘<br/>‘);function isArray(obj){return (typeof obj==‘object‘)&&obj.constructor==Array;}//]]></script>2 判断是否为字符串类型linenum<script type="text/javascript">//<![CDATA[document.write(isString(‘test‘),‘<br/>‘);document.write(isString(10),‘<br/>‘);function isString(str){return (typeof str==‘string‘)&&str.constructor==String;}//]]></script>3 判断是否为数值类型linenum<script type="text/javascript">//<![CDATA[document.write(isNumber(‘test‘),‘<br/>‘);document.write(isNumber(10),‘<br/>‘);function isNumber(obj){return (typeof obj==‘number‘)&&obj.constructor==Number;}//]]></script>4 判断是否为日期类型linenum<script type="text/javascript">//<![CDATA[document.write(isDate(new Date()),‘<br/>‘);document.write(isDate(10),‘<br/>‘);function isDate(obj){return (typeof obj==‘object‘)&&obj.constructor==Date;}//]]></script>5 判断是否为函数linenum<script type="text/javascript">//<![CDATA[document.write(isFunction(function test(){}),‘<br/>‘);document.write(isFunction(10),‘<br/>‘);function isFunction(obj){return (typeof obj==‘function‘)&&obj.constructor==Function;}//]]></script>6 判断是否为对象<script type="text/javascript">linenum//<![CDATA[document.write(isObject(new Object()),‘<br/>‘);document.write(isObject(10),‘<br/>‘);function isObject(obj){return (typeof obj==‘object‘)&&obj.constructor==Object;}//]]></script>原文：http://blog.csdn.net/chen_fuming/article/details/18308515