javascript 简单高效判断数据类型 系列函数 By shawl.qiu

javascript 简单高效判断数据类型 系列函数 By shawl.qiu

linenum
1. <script type="text/javascript">
2. //<![CDATA[
3.     var a=[0];
4.         document.write(isArray(a),'<br/>');
5.     function isArray(obj){
6.         return (typeof obj=='object')&&obj.constructor==Array;
7.     }
8. //]]>
9. </script>

linenum
1. <script type="text/javascript">
2. //<![CDATA[
3.     document.write(isString('test'),'<br/>');
4.     document.write(isString(10),'<br/>');
5.     function isString(str){
6.         return (typeof str=='string')&&str.constructor==String;
7.     }
8. //]]>
9. </script>

linenum
1. <script type="text/javascript">
2. //<![CDATA[
3.     document.write(isNumber('test'),'<br/>');
4.     document.write(isNumber(10),'<br/>');
5.     function isNumber(obj){
6.         return (typeof obj=='number')&&obj.constructor==Number;
7.     }
8. //]]>
9. </script>

linenum
1. <script type="text/javascript">
2. //<![CDATA[
3.     document.write(isDate(new Date()),'<br/>');
4.     document.write(isDate(10),'<br/>');
5.     function isDate(obj){
6.         return (typeof obj=='object')&&obj.constructor==Date;
7.     }
8. //]]>
9. </script>

linenum
1. <script type="text/javascript">
2. //<![CDATA[
3.     document.write(isFunction(function test(){}),'<br/>');
4.     document.write(isFunction(10),'<br/>');
5.     function isFunction(obj){
6.         return (typeof obj=='function')&&obj.constructor==Function;
7.     }
8. //]]>
9. </script>

linenum
1. //<![CDATA[
2.     document.write(isObject(new Object()),'<br/>');
3.     document.write(isObject(10),'<br/>');
4.     function isObject(obj){
5.         return (typeof obj=='object')&&obj.constructor==Object;
6.     }
7. //]]>
8. </script>