最近迷上了原生js,能不用jquery等框架的情况都会手写一些js方法,记得刚接触前端的时候为了选择器而使用jquery。。。现在利用扩展原型的方法实现一些jquery函数:
1.显示/隐藏
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//hide()
Object.prototype.hide = function(){
this.style.
display="none";
return this;
}
//show()
Object.prototype.show = function(){
this.style.
display="block";
return this;
}
return this的好处在于链式调用。
2.滑动
省略speed和callback的传入,因为要加一串判断和处理回调,
代码量大
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//slideDown()
Object.prototype.slideDown = function(){
this.style.
display = 'block';
if(this.clientHeight
0){
this.style.height=this.clientHeight-10+"px";
var _this = this;
setTimeout(function(){_this.slideUp()},10)
}else{
this.style.height=0;
this.style.display = 'none';
}
}
3.捕获/设置
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//attr()
Object.prototype.attr = function(){
if(arguments.length==1){
return eval("this."+arguments[0]);
}else if(arguments.length==2){
eval("this."+arguments[0]+"="+arguments[1]);
return this;
}
}
//val()
Object.prototype.val = function(){
if(arguments.length==0){
return this.value;
}else if(arguments.length==1){
this.value = arguments[0];
return this;
}
}
//html()
Object.prototype.html = function(){
if(arguments.length==0){
return this.innerHTML;
}else if(arguments.length==1){
this.innerHTML = arguments[0];
return this;
}
}
//text()需要在html()结果基础上排除
标签,会很长,省略
4.CSS方法
<div class="jb51code">
<pre class="brush:js;">
//css()
Object.prototype.css = function(){
if(arguments.length==1){
return eval("this.style."+arguments[0]);
}else if(arguments.length==2){
eval("this.style."+arguments[0]+"='"+arguments[1]+"'");
return this;
}
}
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//append()
Object.prototype.append = function(newElem){
this.innerHTML += newElem;
return this;
}
//prepend()
Object.prototype.prepend = function(newElem){
this.innerHTML = arguments[0] + this.innerHTML;
return this;
}
//after()
Object.prototype.after = function(newElem){
this.outerHTML += arguments[0];
return this;
}
//before()
Object.prototype.before = function(newElem){
this.outerHTML = arguments[0] + this.outerHTML;
return this;
}
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//hasClass()
Object.prototype.hasClass = function(cName){
return !!this.className.match( new RegExp( "(\\s|^)" + cName + "(\\s|$)") );
}
//addClass()
Object.prototype.addClass = function(cName){
if( !this.hasClass( cName ) ){
this.className += " " + cName;
}
return this;
}
//removeClass()
Object.prototype.removeClass = function(cName){
if( this.hasClass( cName ) ){
this.className = this.className.replace( new RegExp( "(\\s|^)" + cName + "(\\s|$)" )," " );
}
return this;
}
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Object.prototype.hasClass = function(cName){
return this.classList.contains(cName)
}
Object.prototype.addClass = function(cName){
if( !this.hasClass( cName ) ){
this.classList.add(cName);
}
return this;
}
Object.prototype.removeClass = function(cName){
if( this.hasClass( cName ) ){
this.classList.remove(cName);
}
return this;
}
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//id或class选择器$("elem")
function $(strExpr){
var idExpr = /^(?:\s*(<[\w\W]+>)[^>]*|#([\w-]*))$/;
var classExpr = /^(?:\s*(<[\w\W]+>)[^>]*|.([\w-]*))$/;
if(idExpr.test(strExpr)){
var idMatch = idExpr.exec(strExpr);
return document.getElementById(idMatch[2]);
}else if(classExpr.test(strExpr)){
var classMatch = classExpr.exec(strExpr);
var allElement = document.getElementsByTagName("*");
var ClassMatch = [];
for(var i=0,l=allElement.length; i
需要强调的是,选择器返回的结果或结果集包含的是htmlDOM,并非jquery的对象。大多数人都知道,document.getElementById("id")等价于jquery$("#id")[0],另外上面class选择器选择的结果如需使用,需要利用forEach遍历:
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//siblings()
Object.prototype.siblings = function(){
var chid=this.parentNode.children;
var eleMatch = [];
for(var i=0,l=chid.length;i方法,故命名为userChildren。
Object.prototype.userChildren = function(){
var chid=this.childNodes;
var eleMatch = [];
for(var i=0,l=chid.length;iIoUsElementSibling;
}