js-bind

js built-in hard binding method bind -> soft bindings

      js的修改this的还有call，apply 这里不说它们


            bind 实现原理 (这里写的只不过分装是一个简单的bind实现)

            var objs={
                name:'jimes'
            }
           function test(age){
              console.log(this)  // {name: "jimes"}  test函数被绑定到objs对象里面
              console.log(this.name+":"+age) //jimes:35
          }
          function bind(fun,obj){
             return function(){
              return fun.apply(obj,arguments) 
            }
         }  
        var bar=bind(test,objs);
        bar(35)


        咋们用js自己分装的bind() 试试？

        注意：bind() 也可以实现？柯里化

        function fun1(age){
           console.log(this.name+":"+age) //jimes:89
        }


      var mybind=fun1.bind(objs,89)

       mybind()
       思考？ 

      function fun1(age,sex){
         console.log(this.name+":"+age+":"+sex) //jimes:89:女
      }
      var mybind=fun1.bind(objs,89)
      mybind("女")  


     上面这些都是硬绑定？不是很灵活，看看下面咋们分装的软绑定


      var objs={
         name:'jimes'
      }

       Function.prototype.sofBind=function(obj){
         var _seft=this;
         var curried=[].slice.call(arguments,1)
         //return curried
        var bound=function(){
            return _seft.apply(
                (!this||this===(window||global)?obj:this),
                curried.concat.apply(curried,arguments)
                )
            }
         curried.prototype=Object.create(_seft.prototype);  
        return bound;
     }
  
  
     function test(age,sex){
      console.log(this.name+":"+age+":"+sex) //jimes:12:男
     }

      var mYbind=test.sofBind(objs,12)
     mYbind("男")