放弃jQuery，使用原生js吧！

$(‘.xxx‘);  //class获取  
$(‘#xxx‘);  //id获取  
$(‘.xxx.ccc‘);  //同时包含xxx和ccc  
$(‘.xxx,.zzz‘); //多选  
$(‘.xxx div‘); //子类  
$(‘.xxx p:first‘); //第一个P元素  

//querySelector基本上实现了jq选择器同样的功能，具体可以自己测试，另外querySelector返回的是第一个元素，querySelectorAll则返回所有选择的元素。  
document.querySelector(‘.xxx‘);  //class获取  
document.querySelector(‘#xxx‘);//id获取  
document.querySelector(‘.xxx.ccc‘);//同时包含xxx和ccc  
document.querySelector(‘.xxx,.ccc‘);//多选  
document.querySelector(‘.xxx div‘);//子类  
document.querySelector(‘.xxx p:first-child‘);//第一个P元素  

$(‘.xxx‘).addClass(‘class_name‘);  

el.classList.add(‘class_name‘);  

1 $(‘.xxx‘).removeClass(‘class_name‘);  

el.classList.remove(‘class_name‘);  

$(‘.xxx‘).toggleClass(‘class_name‘);  

el.classList.toggle(‘class_name‘);  

$(‘.xxx‘).hasClass(‘class_name‘);  

el.classList.contains(‘class_name‘); 

//是否包含class    
function hasClass(o, n){  
    return new RegExp(‘\\b‘+n+‘\\b‘).test(o.className);  
};  
//添加class    
function addClass(o, n){  
    if(!hasClass(o, n)) o.className+=‘ ‘+n;  
};  
//删除class    
function delClass(o, n){  
    if(hasClass(o, n)){  
        o.className = o.className.replace(new RegExp(‘(?:^|\\s)‘+n+‘(?=\\s|$)‘), ‘‘).replace(/^\s*|\s*$/g, ‘‘);  
    };  
};  

$(el).before(htmlString);  
$(parent).append(el);  
$(el).after(htmlString);  

parent.appendChild(el);  
el.insertBefore(NewDom,ele);  
ele.insertAdjacentHTML("beforeend", ‘<li>内容</li>‘);    
//具体insertAdjacentHTML的介绍，请移步到 这篇文章（点击这里）  

$(‘.xxx‘).children();  

ele.children;  

$(‘.xxx‘).prev();  

var prev = ele.previousElementSibling || ele.previousSibling   

$(‘.xxx‘).next();  

var next = ele.nextElementSibling || ele.nextSibling   

$(‘.xxx‘).parent();  

ele.parentNode  

$(ele).siblings();  

var siblings = Array.prototype.slice.call(el.parentNode.children);  
for (var i = siblings.length; i--;) {  
    if (siblings[i] === el) {  
        siblings.splice(i, 1);  
        break;  
    };  
};  
;[].forEach.call(el.parentNode.children, function(child){  
    if(child !== el);  
});  

$(selector).each(function(i, el){  
    //xxx  
});  

[].forEach.call(ele,function(el,i){  
    //xxx  
});  

$(‘.xxx‘).clone(true);  

ele.cloneNode(true)  

var ele = $(‘<div></div>‘);  

var ele = document.createElement(‘div‘); 

$(ele).remove();  

//父节点开始删除  
parent.removeChild(ele);  

$(ele).attr(name,value) //设置  
$(ele).attr(name) //获取  
$(ele).removeAttr(name) //删除  

ele.setAttribute(name,value);//设置  
ele.getAttribute(name);//获取  
ele.removeAttribute(name);//删除  

$("body").data("foo", 52);  //设置  
$("body").data("foo");  //获取  
$("body").removeData("foo");  //删除 

ele.dataset.foo = 52  //设置  
ele.dataset.foo  //获取  
  
//也可通过attribute方法来设置获取和删除  
ele.setAttribute(‘data-foo‘, 52);//设置  
ele.getAttribute(‘data-foo‘); //获取  
ele.removeAttribute(‘data-foo‘);//删除 

var html = $(ele).html();  

var html = ele.innerHTML; 

$(el).empty();

el.innerHTML = ‘‘;  

$(ele).text();  

var txt = ele.textContent || ele.innerText  

$(ele).css(‘height‘,‘300px‘);  
  
$(ele).css({  
    height:300  
});  

ele.style.height = ‘300px‘;  
  
ele.style.cssText = ‘height:200px;color:red;left:100px;‘ 

$(obj).css(‘marginLeft‘);  

function getStyle(obj,attr){  
    if(obj.currentStyle){  
        return obj.currentStyle[attr];  
    }else{  
        return getComputedStyle(obj,null)[attr];  
    };  
};  

$(el).show();  
$(el).hide(); 

el.style.display = ‘‘;  
el.style.display = ‘none‘;  

$(ele).height();  

function height(el){      
    var _height = el.clientHeight;      
    var style = el.currentStyle || getComputedStyle(el);        
    return _height - (parseInt(style.paddingTop) + parseInt(style.paddingBottom));      
}; 

$(ele).innerHeight();  

ele.clientHeight;  

$(ele).outerHeight();  

ele.offsetWidth;  

$(ele).outerHeight(true);  

function outerHeight(el){    
    var style = el.currentStyle || getComputedStyle(el);    
    var height = el.offsetHeight + parseInt(style.marginTop) + parseInt(style.marginBottom);    
    return height;    
};  

$(ele).position().left;  
$(ele).position().top;  
  
$(ele).offset().left;  
$(ele).offset().top;  

ele.offsetLeft;  
ele.offsetTop;  
  
function getposi(obj){    
    var t = 0,l = 0;    
    while(obj){    
        t+=obj.offsetTop;    
        l+=obj.offsetLeft;    
        obj = obj.offsetParent;    
    };    
    return {top:t,left:l};    
};  
//getposi(ele).left  
//getposi(ele).top  
ele.getBoundingClientRect().top + window.pageYOffset;  
ele.getBoundingClientRect().bottom + window.pageYOffset;  
ele.getBoundingClientRect().left + window.pageYOffset;  
ele.getBoundingClientRect().right + window.pageXOffset;  

$(document).ready(function() {  
    // Code  
});  

document.addEventListener("DOMContentLoaded", function() {  
    // Code  
},false);  

$(window).load(function() {  
    // Code  
});  

document.addEventListener("load", function() {  
    // Code  
},false);  

$(document).click(function(){  
    //xxx  
}); 

document.onclick = function(){  
        //XXX  
};

$(ele).on(‘click‘,function(){  
    //xxx  
});

document.addEventListener("click", function() {    
        //xxx    
},false);    
  
[].forEach.call(ele,function(o){  
    o.addEventListener("click", function() {    
            //xxx    
    },false);    
});  

$.type(obj);  

function type(obj){  
    return Object.prototype.toString.call(obj).replace(/^\[object (.+)\]$/, "$1").toLowerCase();  
}; 

$.isArray(arr);  

function isArray (v){  
    return Object.prototype.toString.call(v) === ‘[object Array]‘;     
};  

$.trim(string); 

//去除两端空格  
String.prototype.trim = function() {  
    var reExtraSpace = /^\s*(.*?)\s+$/;  
    return this.replace(reExtraSpace, "$1")  
}  
/***扩展一下***/  
//去除左边空格  
String.prototype.ltrim = function() {  
    return this.replace( /^(\s*|　*)/, "");  
}  
//去除右边空格  
String.prototype.rtrim = function() {  
    return this.replace( /(\s*|　*)$/, "");  
}  
//替换全部  
String.prototype.replaceAll = function(s1, s2) {  
    return this.replace(new RegExp(s1, "gm"), s2)  
}  
//去除所有空格，需要配合上面的替换全部  
String.prototype.trimAll = function() {  
    var reExtraSpace = /\s*(.*?)\s+/;  
    return this.replaceAll(reExtraSpace, "$1")  
}  

$.cookie(‘cookie‘); // 读取 cookie  
$.cookie(‘cookie‘, ‘value‘); // 存储 cookie  
$.cookie(‘cookie‘, ‘value‘, { expires: 7 }); // 存储一个带7天期限的 cookie  
$.cookie(‘cookie‘, ‘‘, { expires: -1 }); // 删除 cookie  

$.ajax({  
    type: ‘POST‘,  
    url: ‘/my/url‘,  
    data: data  
});  

var request = new XMLHttpRequest();  
request.open(‘POST‘, ‘/my/url‘, true);  
request.send(data);