jQuery源码分析-----仿栈与队列操作之get | eq

get与eq都是获取指定索引的元素

• get返回的是DOM对象，直接将querySelectorAll返回的第i个元素赋值给this[i]，get[i]取this[i]即可

• eq返回的是jQuery对象，即在用pushStack将this[i]处理。

var $$ = ajQuery = function (selector) {
   return new ajQuery.fn.init(selector);
};
ajQuery.fn = ajQuery.prototype = {
 init:function (selector) {
     this.selector = selector;
	 var results = document.querySelectorAll(selector);
    for(var i = 0;i<results.length;i++){
            this[i] = results[i];
	}
    return this;
},
  constructor:ajQuery
};
ajQuery.prototype.init.prototype = ajQuery.prototype;
ajQuery.extend = ajQuery.fn.extend = function () {
      var target = arguments[0];
      if(arguments.length == 1){
          target = this;
      }
      for(var i = 0;i<arguments.length;i++){
          if((options = arguments[i]) != null) {
                  for(var option in options){
                        target[option] = options[option];
                   }
               }
       }
      return target;
};
ajQuery.fn.extend({
     get:function (num) {{
             if(num != null){
                    return (num<0? this[this.length+num] :this[num]);
              }else{
                     return [].slice.call(this);//返回所有元素
          }
       }},
    setName:function (name) {
         this.name = name;
         return this;
     },
     getName:function () {
                console.log(this.name);
            return this;
     }
});
var li = $$('li').setName('miemie').getName().get(2);
console.log(li);