【转】原生js仿jquery一些常用方法
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< this .scrollHeight){ this .style.height=10+ this .clientHeight+ "px" ; var _this = this ; setTimeout( function (){_this.slideDown()},10) } else { this .style.height= this .scrollHeight+ "px" ; } } //slideUp() Object.prototype.slideUp = function (){ 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
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//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 ; } } |
5.添加元素
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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 ; } |
6.删除/替换元素
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//empty() Object.prototype.empty = function (){ this .innerHTML = "" ; return this ; } //replaceWith() Object.prototype.replaceWith = function (newElem){ this .outerHTML = arguments[0]; return this ; } //remove() js自带,省略。 |
7.设置css类
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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 ; } |
上面的设置CSS类也可以利用html5新API classList及contains实现 但不兼容IE8以下及部分火狐浏览器
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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 ; } |
9.选择器
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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-]*))$/; if (idExpr.test(strExpr)){ var idMatch = idExpr.exec(strExpr); return document.getElementById(idMatch[2]); } else if (classExpr.test(strExpr)){ var classMatch = classExpr.exec(strExpr); var allElement = document.getElementsByTagName( "*" ); var ClassMatch = []; for ( var i=0,l=allElement.length; i<l; i++){ if (allElement[i].className.match( new RegExp( "(\\s|^)" + classMatch[2] + "(\\s|$)" ) )){ ClassMatch.push(allElement[i]); } } return ClassMatch; } } |
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$("#id")[0],另外上面class选择器选择的结果如需使用,需要利用forEach遍历:
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$( ".cls" ).forEach( function (e){ e.css( "background" , "#f6f6f6" ) }) |
10.遍历 siblings()和children()获取的结果也需要结合forEach使用
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//siblings() Object.prototype.siblings = function (){ var chid= this .parentNode.children; var eleMatch = []; for ( var i=0,l=chid.length;i<l;i++){ if (chid[i]!= this ){ eleMatch.push(chid[i]); } } return eleMatch; } //children() 原生js已含有该方法,故命名为userChildren。 Object.prototype.userChildren = function (){ var chid= this .childNodes; var eleMatch = []; for ( var i=0,l=chid.length;i<l;i++){ eleMatch.push(chid[i]); } return eleMatch; } //parent() Object.prototype.parent = function (){ return this .parentNode; } //next() Object.prototype.next = function (){ return this .nextElementSibling; } //prev() Object.prototype.prev = function (){ return this .previousElementSibling; } |