201506101252_《JavaScript时间戳、转义、类型转化、继承》

例如要得到：20150610125348，可以这么做：

1. function CurentTime()
   {
   var now = new Date();
   
   var year = now.getFullYear();         //年
   var month = now.getMonth() + 1;  //月
   var day = now.getDate();              //日
   
   var hh = now.getHours();              //时
   var mm = now.getMinutes();         //分
   var ss = now.getSeconds();           //秒
   
   var clock = year + "-";
   
   if(month < 10)
   clock += "0";
   
   clock += month + "-";
   
   if(day < 10)
   clock += "0";
   
   clock += day + " ";
   
   if(hh < 10)
   clock += "0";
   
   clock += hh + ":";
   if (mm < 10) clock += '0';
   clock += mm + ":";
   
   if (ss < 10) clock += '0';
   clock += ss;
   return(clock);
   };

alert(+new Date(CurentTime()));  

 

二. 转义

var url = encodeURIComponent('http://segmentfault.com/questions/newest');  //http://%&54....

decodeURIComponent(url);  //http://segmentfault.com/questions/newest

 

三. 小数点后几位

var someNum.toFixed(2);   //保留小数点后两位

 

四. 检测类型

var toJudge = Object.prototype.toString;

var whatType = toJudge.call(new Date);

alert(whatType);  //object,date

 

五. 继承

function  Shape() {

　　this.x = 0;

      this.y = 0;

}

Shape.prototype.move = function(x,y) {

　　this.x += x;

      this.y += y;

      console.info("This is moving action..."); 

}

 

function Rectangle() {

　　Shape.call(this);

}

 

var rect = new Rectangle();

alert(rect instanceof Rectangle); //true

alert(rect instanceof Shape);  //true

rect.move(2,3);