(function() {    var arr = [1, 2, 3, 3, 4, ];    function unique() {      var result = [];      var tem = {};      for (var i = 0; i < arr.length; i++) {        if (!tem[arr[i]]) {          result.push(arr[i]);          tem[arr[i]] = 1;        }      }      return result;    }})();

//遍歷多維數(shù)組var arr = [1, 2, 3, [4, [5, [6]]]]; // arr.lengthArray.prototype.each = function(fn) {  try {    //1 目的： 遍歷數(shù)組的每一項 //計數(shù)器 記錄當前遍歷的元素位置    this.i || (this.i = 0); //var i = 0 ;    //2 嚴謹?shù)呐袛嗍裁磿r候去走each核心方法    // 當數(shù)組的長度大于0的時候 && 傳遞的參數(shù)必須為函數(shù)    if (this.length > 0 && fn.constructor == Function) {      // 循環(huán)遍歷數(shù)組的每一項      while (this.i < this.length) { //while循環(huán)的范圍        //獲取數(shù)組的每一項        var e = this[this.i];        //如果當前元素獲取到了 并且當前元素是一個數(shù)組        if (e && e.constructor == Array) {          // 直接做遞歸操作          e.each(fn);        } else {          //如果不是數(shù)組 （那就是一個單個元素）          // 這的目的就是為了把數(shù)組的當前元素傳遞給fn函數(shù) 并讓函數(shù)執(zhí)行          //fn.apply(e,[e]);          fn.call(e, e);        }        this.i++;      }      this.i = null; // 釋放內(nèi)存 垃圾回收機制回收變量    }  } catch (ex) {    // do something  }  return this;}

//獲取url參數(shù)function GetQueryString(name) {  var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");  //js match返回的是一數(shù)組  var r = location.search.substr(1).match(reg);  if (r != null) {    return r[2];  } else {    return null;  }}

/**去掉字符串前后所有空格*/function trim(str){return str.replace(/(^/s*)|(/s*$)/g, "");}

var obj={name:'seven'};var a=function(){};a.prototype=obj;var aa=new a();alert(aa.name);

function people(name,age){  //屬性  this.name=name;  this.age=age;  //方法  this.show=function(){    console.log("my name is"+this.name+" and I am "+this.age+" years old");  };}function student(name,age,school){  people.apply(this,arguments);  this.school=school;  this.showYourself=function(){    console.log("my name is"+this.name+" and I am "+this.age+" years old"+" my school is"+ this.school);  };}var tom=new student('tom','19','xtu');tom.showYourself();