javascript方法总结

1: 获取对象的键

var obj = {id:1,name:'xxx'};

var keys = Object.keys(obj);

      //keys : ['id','name']

2: 获取对象键值对的长度

var obj = {id:1,name:'xxx'};

var length = Object.keys(obj).length; // 2

3: 对象循环遍历

var obj = {id:1,name:'xxx'};

for(var key in obj){

     if(obj.hasOwnProperty(key)){

           console.log(obj[key]);

      }

}

4:获取两个数之间的随机数

/**

* JS获取n至m随机整数

* 摘自 :http://www.qttc.net/201207115.html

*/

functionrd(n,m){

varc = m-n+1;

returnMath.floor(Math.random() * c + n);

}

varn =5;

varm =10;

console.log(rd(n,m));