Detailed explanation of jquery traversal and adding Json object code examples

jquery method of dynamically traversing the properties and values ​​of Json objects.

1. Traverse the attributes of the json object

//定义json对象
 var person= {
 name: 'zhangsan',
 pass: '123',

 fn: function(){

   alert(this.name+"的密码="+this.pass);

 }
 }
 //遍历person属性包括方法，如果不想显示出方法，可用typeof(person[item])== "function"来判断
 for(var item in person){
 alert("person中"+item+"的值="+person[item]);
 }

2. Dynamically add attributes to the json object

You need to use the person object in 1

var copyPerson={}  //创建copyPerson对象，将person中的属性包括方法copy给该对象
 for(var item in person){
 copyPerson[item]= person[item];  //这样循环就可以将person中的属性包括方法copy到copyPerson中了
 }
 
 for(var item in copyPerson){
 alert("copyPerson中"+item+"的值="+person[item]);
 }

Note: Using Ext.apply(copyPerson, person) you can also copy all attributes including methods in person to copyPerson

3. Traverse the properties of ordinary js objects

//定义一个普通的js类，包含方法
 var p= function (){
 this.name= '李四';
 this.pass= '456';
 this.fn= function(){
  alert(this.name+"的密码="+this.pass);
 }
 
 }

 var pp= new p();  //生成一个p类的对象 pp
 
 for(var item in pp){
 
 //遍历pp对象中的属性，只显示出 非函数的 属性，注意不能 遍历 p这个类
 if(typeof(pp[item])== "function")
  continue;
 alert("p对象中"+item+"的属性="+pp[item]);
 }

Ordinary js objects can also be copied. The copy method has the same idea as 2. Dynamically adding attributes to the json object.

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