lovecoding
/
web0715


			
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    <script>
        //10、用call 或 apply 实现bind 方法
        function foo(str1,str2) {
            console.log(this.a,str1,str2)
        }
        var obj = {
            a: "hello"
        }
        // foo.bind(obj);
        // 实现代码
        Function.prototype.bind2 = function(){
            // console.log(this);
            var _obj = arguments[0];
            // var p1 = arguments[1];
            // var p2 = arguments[2];
            // console.log(Array.from(arguments))
            var pArr = Array.prototype.slice.call(arguments,1);
            // console.log(pArr);
            // console.log(arguments);
            var that = this;
            return function(){
                // console.log(that)
                that.apply(_obj,pArr)
            }
        }

        var obj1 = {
            a:"world"
        }

        // 执行
        var foo2 = foo.bind2(obj1,"love","coding");
        foo2()//hello

        // function foo3(){
        //     console.log(this.a)
        // }
        // var foo4 = foo3.bind2(obj);
        // foo4();


        var arr = ["obj",'a','b','c','d'];
        var arr1 = arr.slice(1);
        // console.log(arr1);
    </script>
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