escape/unescape : 涓嶈兘瀵箄ri緙栫爜, 浼氭妸 / ? @ 榪涜緙栫爜
encodeURIComponet/decodeURIComponent : 瀵筓RI鍙傛暟緙栫爜, 浼氭妸 / 榪涜緙栫爜
encodeURI/decodeURI : 瀵筓RI緙栫爜
From : http://blog.163.com/free_for_all/blog/static/6871811201192441843281/
From : http://www.cnblogs.com/qiantuwuliang/archive/2009/07/19/1526687.html
]]>
/* 鍙傝?: http://www.w3school.com.cn/xmldom/dom_http.asp */
/*
* 鑾峰彇ajax瀵硅薄
*/
function getXmlHttpRequest(){
var xhr = null;
if(typeof(XMLHttpRequest) != 'undefined'){
xhr = new XMLHttpRequest();
}else{
xhr = new ActiveXObject("Microsoft.XMLHttp");
}
return xhr;
}
/*
* post鏂瑰紡璇鋒眰
*/
function post(url, queryString,fn){
var xhr = getXmlHttpRequest();
xhr.open('post',url,true);
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xhr.onreadystatechange=function(){
if(xhr.readyState == 4){
if(xhr.status == 200){
fn.apply(this,[xhr]);
}
}
};
xhr.send(queryString);
}
/*
* get鏂瑰紡璇鋒眰
*/
function get(url,fn){
var xhr = getXmlHttpRequest();
xhr.open('get',url,true);
xhr.onreadystatechange=function(){
if(xhr.readyState == 4){
if(xhr.status == 200){
fn.apply(this,[xhr]);
}
}
};
xhr.send(null);
}
/*
* 嫻嬭瘯
*/
post("ajax","",function(xhr){
alert(xhr.responseText);
});
/*
* 鑾峰彇ajax瀵硅薄
*/
function getXmlHttpRequest(){
var xhr = null;
if(typeof(XMLHttpRequest) != 'undefined'){
xhr = new XMLHttpRequest();
}else{
xhr = new ActiveXObject("Microsoft.XMLHttp");
}
return xhr;
}
/*
* post鏂瑰紡璇鋒眰
*/
function post(url, queryString,fn){
var xhr = getXmlHttpRequest();
xhr.open('post',url,true);
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xhr.onreadystatechange=function(){
if(xhr.readyState == 4){
if(xhr.status == 200){
fn.apply(this,[xhr]);
}
}
};
xhr.send(queryString);
}
/*
* get鏂瑰紡璇鋒眰
*/
function get(url,fn){
var xhr = getXmlHttpRequest();
xhr.open('get',url,true);
xhr.onreadystatechange=function(){
if(xhr.readyState == 4){
if(xhr.status == 200){
fn.apply(this,[xhr]);
}
}
};
xhr.send(null);
}
/*
* 嫻嬭瘯
*/
post("ajax","",function(xhr){
alert(xhr.responseText);
});
]]>
function test(){
var i = 1;
this.j = 2;
alert(i + j);
}
js閫氱敤鐨勫畾涔塮unction鐨勬柟寮?
this.j 鍙橀噺灞炰簬test鏂規硶鐨勬墍鏈夎厀indow瀵硅薄
2. function
var test = function(){
var i = 1;
this.j = 2;
alert(i + j);
}
涓庣1縐嶆柟寮忕瓑浠?br />
3. new function
var test = new function(){
var i = 1;
this.j = 2;
alert(i + j);
}
鐩稿綋浜庡畾涔変簡涓涓璞″悕涓篺unction鐨凮bject
i 鍙橀噺灝辨槸function鏋勯犳柟娉曚腑鐨勪竴涓眬閮ㄥ彉閲?br />j 鍙橀噺灝辨槸function瀵硅薄鐨勫睘鎬?br />瑕佹墽琛岃繖涓柟娉?
test.constructor();
4. new Function
var test = new Function('
var i = 1;
this.j = 2;
alert(i + j);
');
榪欓噷浣跨敤浜唈s鐨勫唴緗璞unction, 鏁堟灉絳変環浜庣2縐嶆柟寮?br />
5. Function
var test = Function('
var i = 1;
this.j = 2;
alert(i + j);
');
鏁堟灉絳変環浜庣4縐嶆柟寮?br />
]]>
typeof鍙兘澶熺‘瀹氬叚縐嶆暟鎹被鍨?/strong>
1. number
2. boolean
3. string
4. function
5. object
6. undefined
璇硶:
1. typeof varName
2. typeof(varName)
浣跨敤:
var i = 1;
if(typeof i == "number"){
alert("i type is number.");
}
instanceof鍙互鍒ゆ柇瀵硅薄鐨勫叿浣撶被鍨?/strong>
璇硶:
varName instanceof ObjectType;
浣跨敤:
var obj = new Date();
var isDate = obj instanceof Date;
alert(isDate);
]]>