原文地址:http://www.admin10000.com/document/3929.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。
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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$.ajax({ type:'POST',
url:'/my/url',
data: data
}); |
IE8+:
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varrequest = newXMLHttpRequest();
request.open('POST','/my/url',true);
request.send(data); |
Ajax Get
jQuery:
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$.ajax({ type:'GET',
url:'/my/url',
success:function(resp) {
},
error:function() {
}
}); |
IE8+:
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request = newXMLHttpRequest();
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;
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加载 JSON
jQuery:
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$.getJSON('/my/url',function(data) {
}); |
IE8+:
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request = newXMLHttpRequest();
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;
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淡入效果
jQuery:
| 1 | $(el).fadeIn(); |
IE8+:
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functionfadeIn(el) {
varopacity = 0;
el.style.opacity = 0;
el.style.filter = '';
varlast = +newDate();
vartick = function() {
opacity += (newDate() - last) / 400;
el.style.opacity = opacity;
el.style.filter = 'alpha(opacity='+ (100 * opacity)|0 + ')';
last = +newDate();
if(opacity < 1) {
(window.requestAnimationFrame && requestAnimationFrame(tick)) || setTimeout(tick, 16);
}
};
tick();
}fadeIn(el); |
显示和隐藏
jQuery:
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$(el).show();$(el).hide(); |
IE8+:
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el.style.display = '';
el.style.display = 'none';
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添加 Class
jQuery:
| 1 | $(el).addClass(className); |
IE8+:
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if(el.classList)
el.classList.add(className);
else el.className += ' ' + className;
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插入 HTML
jQuery:
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$(el).before(htmlString);$(parent).append(el);$(el).after(htmlString); |
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el.insertAdjacentHTML('beforebegin', htmlString);
parent.appendChild(el);el.insertAdjacentHTML('afterend', htmlString);
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获取子节点
jQuery:
| 1 | $(el).children(); |
IE8+:
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varchildren = [];
for(vari=el.children.length; i--;){
// Skip comment nodes on IE8
if(el.children[i].nodeType != 8)
children.unshift(el.children[i]);
} |
循环节点
jQuery:
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$(selector).each(function(i, el){
}); |
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functionforEachElement(selector, fn) {
varelements = document.querySelectorAll(selector);
for(vari = 0; i < elements.length; i++)
fn(elements[i], i);
}forEachElement(selector,function(el, i){
}); |
清空节点
jQuery:
| 1 | $(el).empty(); |
IE8+:
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while(el.firstChild)
el.removeChild(el.firstChild)
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过滤节点
jQuery:
| 1 | $(selector).filter(filterFn); |
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functionfilter(selector, filterFn) {
varelements = document.querySelectorAll(selector);
varout = [];
for(vari = elements.length; i--;) {
if(filterFn(elements[i]))
out.unshift(elements[i]);
}
returnout;
}filter(selector, filterFn); |
查找元素
jQuery:
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$(el).find(selector);$('.my #awesome selector');
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el.querySelectorAll(selector);document.querySelectorAll('.my #awesome selector');
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获取属性、HTML或者文本
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$(el).attr('tabindex');
$(el).html();$('<div>').append($(el).clone()).html();
$(el).text(); |
IE8+:
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el.getAttribute('tabindex');
el.innerHTMLel.outerHTMLel.textContent || el.innerText |
判断是否包含某个 css class
jQuery:
| 1 | $(el).hasClass(className); |
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if(el.classList)
el.classList.contains(className);
else newRegExp('(^| )' + className + '( |$)','gi').test(el.className);
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选择器匹配
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$(el).is('.my-class');
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varmatches = 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{
varnodes = el.parentNode.querySelectorAll(selector);
for(vari = nodes.length; i--;)
if(nodes[i] === el) {
returntrue;
}
returnfalse;
}matches(el,'.my-class');
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前一个节点
jQuery:
| 1 | $(el).prev(); |
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// prevSibling can include text nodesfunctionpreviousElementSibling(el) {
do{ el = el.previousSibling; } while( el && el.nodeType !== 1 );
returnel;
}el.previousElementSibling || previousElementSibling(el); |
后一个节点
jQuery:
| 1 | $(el).next(); |
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// nextSibling can include text nodesfunctionnextElementSibling(el) {
do{ el = el.nextSibling; } while( el && el.nodeType !== 1 );
returnel;
}el.nextElementSibling || nextElementSibling(el); |
外部高度
jQuery:
| 1 | $(el).outerHeight() |
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functionouterHeight(el, includeMargin){
varheight = el.offsetHeight;
if(includeMargin){
varstyle = el.currentStyle || getComputedStyle(el);
height += parseInt(style.marginTop) + parseInt(style.marginBottom);
}
returnheight;
}outerHeight(el,true);
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外部宽度
jQuery:
| 1 | $(el).outerWidth() |
IE8+:
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functionouterWidth(el, includeMargin){
varheight = el.offsetWidth;
if(includeMargin){
varstyle = el.currentStyle || getComputedStyle(el);
height += parseInt(style.marginLeft) + parseInt(style.marginRight);
}
returnheight;
}outerWidth(el,true);
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判断是否数组
jQuery:
| 1 | $.isArray(arr); |
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isArray = Array.isArray || function(arr) {
returnObject.prototype.toString.call(arr) == '[object Array]';
}isArray(arr); |
数组转换
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$.map(array,function(value, index){
}) |
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functionmap(arr, fn) {
varresults = []
for(vari = 0; i < arr.length; i++)
results.push(fn(arr[i], i))
returnresults
}map(array,function(value, index){
}) |