图老师小编精心整理的JQuery教程:简化JQuery希望大家喜欢，觉得好的亲们记得收藏起来哦！您的支持就是小编更新的动力~
【 tulaoshi.com - Web开发 】
（本文来源于图老师网站，更多请访问http://www.tulaoshi.com/webkaifa/）这是以前整理的一些代码，与JQer分享，希望对大家能有些帮助。
//不完全一致，但实现手段大致如此
(function(){
window._$ = window.$;
var $ = window.$ = function(s) {
return new $.fn.init(s);
};
$.fn = $.prototype = {
init: function(s) {
if(!s) return this;
if (s.nodeType) {
this.e = [];
this.e.push(s); //存储获取到的Elements
return this;
}
if (typeof s == string) {
return $().find(s);
}
return this;
},
find: function(s) {
//根据传入的String，查找DOM
}
};
// extend扩展方法
$.fn.extend = function(p) {
for(var key in p) {
if(!$.fn[key]) {
$.fn[key] = p[key];
}
}
};
$.fn.init.prototype = $.fn;
})();
$().extend({
a: function(s){},
b: function(s){}
});再附上我简化的版本代码:// by CNwander
(function(){
window._$ = window.$;
var eleExpr = /([#.a-zA-Z])([^s]+)/g;
var $ = window.$ = function(s) {
return new $.fn.init(s);
};
$.fn = $.prototype = {
init: function(s) {
this.e = null;
if(!s) return this;
if (s.nodeType) {
this.e = [];
this.e.push(s);
return this;
}
if (typeof s == string) {
return $().find(s);
}
else
return this;
},
find: function(s) {
var wrap = this.e || [document];
var result = [];
for(var key in wrap) {
var target = wrap[key];
while(eleExpr.test(s)) {
var first = RegExp.$1,
content = RegExp.$2;
target = $().clean(target,content,first);
}
if(target == null)
result = null;
else
for(var i = 0; i target.length; i++)
result.push(target[i]);
}
this.e = result;
return this;
},
clean: function(wrap,content,type){
if(!wrap) return null;
wrap = wrap instanceof Array ？ wrap : [wrap];
var result = new Array();
for(var key in wrap) {
var temp;
switch(type) {
case #:
temp = wrap[key].getElementById(content);
break;
case .:
temp = $().getElemsByClassName(content,wrap[key]);
break;
default:
temp = wrap[key].getElementsByTagName(type+content);
}
if(temp) {
temp = temp.length ？ temp : [temp];
for (var i = 0; i temp.length; i++)
if(temp[i].nodeType) result.push(temp[i]);
}
}
result = result.length = 0 ？ null : result;
return result;
},
getElemsByClassName: function(classname,elem,tag) {
tag = tag || *;
elem = elem || document;
elem = elem instanceof Array ？ elem : [elem];
var result = new Array();
for(var key in elem) {
var allElems = elem[key].getElementsByTagName(tag) || elem[key].all;
var oElem;
for(var i=0; iallElems.length; i++){
oElem = allElems[i];
var list = oElem.className.split( );
for(var j=0; jlist.length; j++){
if(list[j] == classname) result.push(oElem);
}
}
}
return result.length = 0 ？ null : result;
}
};
$.fn.extend = function(p) {
for(var key in p) {
if(!$.fn[key]) {
$.fn[key] = p[key];
}
}
};
$.fn.init.prototype = $.fn;
})();
$.ajax = function(url,postStr,lastfunc,errfunc) {
var ajax = false;
if(window.XMLHttpRequest) {
ajax = new XMLHttpRequest();
if (ajax.overrideMimeType) {
ajax.overrideMimeType(text/xml);
}
}
else if (window.ActiveXObject) {
try {
ajax = new ActiveXObject(Msxml2.XMLHTTP);
}
catch (e) {
try {
ajax = new ActiveXObject(Microsoft.XMLHTTP);
}
catch (e) {
}
}
}
if (!ajax) {
if(errfunc) errfunc();
return false;
}
ajax.open(POST, url, true);
ajax.setRequestHeader(Content-Type,application/x-www-form-urlencoded);
ajax.send(postStr);
ajax.onreadystatechange = function() {
if (ajax.readyState == 4 && ajax.status == 200) {
if(lastfunc) lastfunc(ajax.responseText);
}
}
}
$().extend({
html: function(val){
return val == undefined ？
(this.e[0] ？
this.e[0].innerHTML :
null) :
this.e[0].innerHTML = val;
},
empty: function() {
for(var i in this.e) {
var o = this.e[i];
o.innerHTML = ;
}
return this;
},
css: function() {
if(!this.e || arguments.length = 0) return this;
if(arguments.length == 1 && typeof arguments[0] == string) {
arguments[0] = arguments[0].toLowerCase();
return this.e[0].currentStyle ？
this.e[0].currentStyle[arguments[0]] :
window.getComputedStyle (this.e[0], ).getPropertyValue(arguments[0].replace(/([A-Z])/g, -$1″));
}
else if(arguments.length = 2) {
for (var i in this.e)
this.e[i].style[arguments[0]] = arguments[1];
}
},
hasClass: function(name) {
if(!this.e) return this;
var allClass = this.e[0].className.split( );
for (var key in allClass)
if(allClass[key] == name) return true;
return false;
},
addClass: function(name){
if(this.e)
for (var i in this.e)
if(this.e[i].nodeType == 1)
this.e[i].className += +name;
return this;
},
removeClass: function(name){
if(this.e)
for (var i in this.e) {
var temp = [],
allClass = this.e[i].className.split( );
for(var j = 0, k = 0; j allClass.length; j++) {
if(allClass[j] != name) {
temp[k++] = allClass[j]
}
}
allClass = temp.join( );
this.e[i].className = allClass;
}
return this;
},
mousedown: function(callback){
if(!this.e) return this;
for(var key in this.e) {
this.e[key].onmousedown = callback;
return this;
}
},
mouseover: function(callback){if(!this.e) return this;for(var key in this.e) {this.e[key].onmouseover = callback} return this},
mouseout: function(callback){if(!this.e) return this;for(var key in this.e) {this.e[key].onmouseout = callback}return this}
});才疏学浅，错误之处，敬请指正。
来源:http://www.tulaoshi.com/n/20160220/1633355.html
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