http://youmightnotneedjquery.com/
摘自:http://www.cnblogs.com/lhb25/p/you-might-not-need-jquery.html
很多的 JavaScript 开发人员,包括我在内,都很喜欢 jQuery。因为它的简单,因为它有很多丰富的插件可供使用,和其它优秀的工具一样,jQuery 让我们开发人员能够更轻松的开发网站和 Web 应用。
然而,另一方面,作为前端开发的基础框架,jQuery 包含大量的兼容性代码和扩展功能,其中有很多在你的整个项目中可能都不会用到。其实如果你只是针对现代浏览器,很多功能使用原生的 JavaScript 就可以实现,即使是拖后腿的低版本 IE 浏览器,兼容性也是很容易处理的。
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下面就带大家一起看看在 IE 浏览器环境中如果使用原生 JavaScript 代码实现 jQuery 中的功能。如果你打算自己开发一个小的基础框架,可以好好参考一下这些代码的实现。
Ajax Post
jQuery:
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$.ajax({ type: 'POST' , url: '/my/url' , data: data }); |
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var request = new XMLHttpRequest(); request.open( 'POST' , '/my/url' , true ); request.send(data); |
Ajax Get
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$.ajax({ type: 'GET' , url: '/my/url' , success: function (resp) { }, error: function () { } }); |
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request = new XMLHttpRequest(); request.open( 'GET' , '/my/url' , true ); request.onreadystatechange = function () { if ( this .readyState === 4){ if ( this .status >= 200 && this .status < 400){ // Success! resp = this .responseText; } else { // Error :( } } } request.send(); request = null ; |
加载 JSON
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$.getJSON( '/my/url' , function (data) { }); |
IE8+:
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request = new XMLHttpRequest(); request.open( 'GET' , '/my/url' , true ); request.onreadystatechange = function () { if ( this .readyState === 4){ if ( this .status >= 200 && this .status < 400){ // Success! data = JSON.parse( this .responseText); } else { // Error :( } } } request.send(); request = null ; |
淡入效果
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$(el).fadeIn(); |
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function fadeIn(el) { var opacity = 0; el.style.opacity = 0; el.style.filter = '' ; var last = + new Date(); var tick = function () { opacity += ( new Date() - last) / 400; el.style.opacity = opacity; el.style.filter = 'alpha(opacity=' + (100 * opacity)|0 + ')' ; last = + new Date(); if (opacity < 1) { (window.requestAnimationFrame && requestAnimationFrame(tick)) || setTimeout(tick, 16); } }; tick(); } fadeIn(el); |
显示和隐藏
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$(el).show(); $(el).hide(); |
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el.style.display = '' ; el.style.display = 'none' ; |
添加 Class
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$(el).addClass(className); |
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if (el.classList) el.classList.add(className); else el.className += ' ' + className; |
插入 HTML
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$(el).before(htmlString); $(parent).append(el); $(el).after(htmlString); |
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el.insertAdjacentHTML( 'beforebegin' , htmlString); parent.appendChild(el); el.insertAdjacentHTML( 'afterend' , htmlString); |
获取子节点
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$(el).children(); |
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var children = []; for ( var i=el.children.length; i--;){ // Skip comment nodes on IE8 if (el.children[i].nodeType != 8) children.unshift(el.children[i]); } |
循环节点
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$(selector).each( function (i, el){ }); |
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function forEachElement(selector, fn) { var elements = document.querySelectorAll(selector); for ( var i = 0; i < elements.length; i++) fn(elements[i], i); } forEachElement(selector, function (el, i){ }); |
清空节点
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$(el).empty(); |
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while (el.firstChild) el.removeChild(el.firstChild) |
过滤节点
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$(selector).filter(filterFn); |
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function filter(selector, filterFn) { var elements = document.querySelectorAll(selector); var out = []; for ( var i = elements.length; i--;) { if (filterFn(elements[i])) out.unshift(elements[i]); } return out; } filter(selector, filterFn); |
查找元素
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$(el).find(selector); $( '.my #awesome selector' ); |
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el.querySelectorAll(selector); document.querySelectorAll( '.my #awesome selector' ); |
获取属性、HTML或者文本
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$(el).attr( 'tabindex' ); $(el).html(); $( '<div>' ).append($(el).clone()).html(); $(el).text(); |
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el.getAttribute( 'tabindex' ); el.innerHTML el.outerHTML el.textContent || el.innerText |
判断是否包含某个 css class
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$(el).hasClass(className); |
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if (el.classList) el.classList.contains(className); else new RegExp( '(^| )' + className + '( |$)' , 'gi' ).test(el.className); |
选择器匹配
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$(el).is( '.my-class' ); |
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var matches = function (el, selector) { var _matches = (el.matches || el.matchesSelector || el.msMatchesSelector || el.mozMatchesSelector || el.webkitMatchesSelector || el.oMatchesSelector); if (_matches) { return _matches.call(el, selector); } else { var nodes = el.parentNode.querySelectorAll(selector); for ( var i = nodes.length; i--;) if (nodes[i] === el) { return true ; } return false ; } matches(el, '.my-class' ); |
前一个节点
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$(el).prev(); |
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// prevSibling can include text nodes function previousElementSibling(el) { do { el = el.previousSibling; } while ( el && el.nodeType !== 1 ); return el; } el.previousElementSibling || previousElementSibling(el); |
后一个节点
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$(el).next(); |
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// nextSibling can include text nodes function nextElementSibling(el) { do { el = el.nextSibling; } while ( el && el.nodeType !== 1 ); return el; } el.nextElementSibling || nextElementSibling(el); |
外部高度
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$(el).outerHeight() |
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function outerHeight(el, includeMargin){ var height = el.offsetHeight; if (includeMargin){ var style = el.currentStyle || getComputedStyle(el); height += parseInt(style.marginTop) + parseInt(style.marginBottom); } return height; } outerHeight(el, true ); |
外部宽度
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$(el).outerWidth() |
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function outerWidth(el, includeMargin){ var height = el.offsetWidth; if (includeMargin){ var style = el.currentStyle || getComputedStyle(el); height += parseInt(style.marginLeft) + parseInt(style.marginRight); } return height; } outerWidth(el, true ); |
判断是否数组
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$.isArray(arr); |
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isArray = Array.isArray || function (arr) { return Object.prototype.toString.call(arr) == '[object Array]' ; } isArray(arr); |
数组转换
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$.map(array, function (value, index){ }) |
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function map(arr, fn) { var results = [] for ( var i = 0; i < arr.length; i++) results.push(fn(arr[i], i)) return results } map(array, function (value, index){ }) |
类似的还有很多很多,可以参考这里:http://youmightnotneedjquery.com/。
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