如题,传入一对象,如何判断是什么类型的对象?
注:typeof不能取得具体是那种类型的。
注:typeof不能取得具体是那种类型的。
解决方案 »
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<SCRIPT LANGUAGE="JavaScript">
<!--
function objectType(obj) {
var constructor = "";
if (obj != undefined && obj.constructor != undefined) {
// alert(obj.constructor);
constructor = (String)(obj.constructor);
var tokens = constructor.split(" ");
// alert("constructor:" + constructor + "\ntokens:"+tokens);
var size = tokens.length;
for(var i=0; i<size; i++) {
if(tokens[i].indexOf("function") != -1) {
var end = tokens[i+1].indexOf("(");
// alert(end);
if(end == -1) {
return(tokens[i+1]);
} else {
// alert(tokens[i+1].substring(0, end).length);
return(tokens[i+1].substring(0, end));
}
}
}
}
}
// END objectType
var s1 = "I am a string";
var s2 = true;
var s3 = 100;
var s4 = new Date();
var s5 = new Array();
var s6;
//s7;
//alert(objectType(s1)); //string
//alert(objectType(s2)); //boolean
//alert(objectType(s3)); //number
//alert(objectType(s4)); //date
//alert(objectType(s5)); //array
//alert(objectType(s6)); //undefined
//alert(objectType(s7)); //undefined
//-->
</SCRIPT>
返回一个 Boolean 值,指出对象是否是特定类的一个实例。result = object instanceof classfunction objTest(obj){
var i, t, s = ""; // 创建变量。
t = new Array(); // 创建一个数组。
t["Date"] = Date; // 填充数组。
t["Object"] = Object;
t["Array"] = Array;
for (i in t)
{
if (obj instanceof t[i]) // 检查 obj 的类。
{
s += "obj is an instance of " + i + "\n";
}
else
{
s += "obj is not an instance of " + i + "\n";
}
}
return(s); // 返回字符串。
}var obj = new Date();
alert(objTest(obj));
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http://download.csdn.net/source/308913样式表中文手册.chm
http://download.csdn.net/source/304124
var getType = function(obj){
alert(obj.constructor.toString().match(/^function\s([^\(]*?)\(\)/i)[1]);
};getType(1);
getType('str');
getType(true);
getType(new Date());
getType([]);
getType({});
getType(function(){});
</script>
//Object.prototype.typeof =
//function typeofobj(obj) {
typeof = function(obj) {
var constructor = "";
if (obj != undefined && obj.constructor != undefined) {
// alert(obj.constructor);
constructor = (String)(obj.constructor);
var tokens = constructor.split(" ");
// alert("constructor:" + constructor + "\ntokens:"+tokens);
var size = tokens.length;
for(var i=0; i<size; i++) {
if(tokens[i].indexOf("function") != -1) {
var end = tokens[i+1].indexOf("(");
// alert(end);
if(end == -1) {
return(tokens[i+1].toLowerCase());
} else {
// alert(tokens[i+1].substring(0, end).length);
return(tokens[i+1].substring(0, end).toLowerCase());
}
}
}
}
}
// END typeofobj
var s1 = "I am a string";
var s2 = true;
var s3 = 100;
var s4 = new Date();
var s5 = new Array();
var s6;
//s7;
//alert(typeofobj(s1)); //string
//alert(typeofobj(s2)); //boolean
//alert(typeofobj(s3)); //number
//alert(typeofobj(s4)); //date
alert(typeofobj(s5)); //array
//alert(typeofobj(s6)); //undefined
//alert(typeofobj(s7)); //未定义
//-->
我这个才叫强大,哈哈,不信试试。
function varType(v){
if(typeof v==="object"){
if(v===null)return 'null';
if(v.constructor)
return (v.constructor.toString()).match(/(?: )[\w\$]+/)[0];
if(typeof typeof2==='undefined' && window.execScript){
window.execScript('Function vbsTypeName(o):vbsTypeName=TypeName(o):End Function','vbscript');
window.execScript('function typeof2(o){return vbsTypeName(o)}','jscript');
}
if(typeof typeof2!=='undefined'){
return typeof2(v);
}
return "object";
}
return typeof v;
}//对于普通js常量和js对象,各浏览器是基本一致的
alert(varType()); //undefined
alert(varType(100)); //number
alert(varType({})); //Object
alert(varType([])); //Array
alert(varType(/ /)); //RegExp
alert(varType(new Date())); //Date
alert(varType(Date)); //function
alert(varType(Object)); //function
alert(varType(RegExp)); //function//对于DOM对象,各浏览器可能会有不同值
alert(varType(window)); //IE:HTMLWindow2 FF:Window
alert(varType(document)); //IE:HTMLDocument FF:HTMLDocument
alert(varType(document.body)); //IE:HTMLBody FF:HTMLBodyElement
alert(varType(Option)); //IE:Object FF:function
alert(varType(Image)); //IE:Object FF:function
alert(varType(navigator)); //IE:DispHTMLNavigator FF:Navigator//以下几个只适用于IE,其他内核浏览器不支持
alert(varType(ActiveXObject)); //IE:function
alert(varType(Enumerator)); //IE:function
alert(varType(new ActiveXObject("Scripting.Dictionary"))); //IE:Dictionary
alert(varType(new Enumerator())); //IE:Enumerator