javascript面向对象(十五)-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_25707185/article/details/52971730

<!doctype html>
<html>
  <head>
    <title>标题</title>
    <meta charset="utf-8">
    <script>
if(Function.prototype.bind===undefined){
  Function.prototype.bind=
    function(obj/*,args1*/){
      var fun=this;//原函数对象
      //arguments:[obj,xx,xx,xx,]
      var args1=
        Array.prototype.slice.call(
          arguments,1
        );//arguments.slice(1)
      return function(/*args2*/){
        //arguments=>args2
        //类数组对象转数组
        var args2=
          Array.prototype.slice.call(  
            arguments/*,?*/
          );//arguments.slice()
        //this->obj替换this
        fun.apply(
          obj,args1.concat(args2));
      }
    }
}
function calc(base,bonus){
  document.write(this.name+
    "的总工资是"+(base+bonus)+"<br>");
}
//this:和定义的位置无关！
//     只和调用时，.前的对象有关
var lilei={name:"Li Lei"};
var hmm={name:"hmm"};
calc.call(lilei,10000,5000);//临时借用
calc.call(hmm,9000,8000);//临时借用
var lilei_calc=calc.bind(lilei,10000);
//lilei_calc:function(){//永久绑定
  //this->lilei ; base->10000
  //calc
//}
lilei_calc(5000);
lilei_calc(6000);
var hmm_calc=calc.bind(hmm,9000)
hmm_calc(8000);
    </script>
  </head>
  <body>
    
  </body>
</html>