重写bind方法

var that = null;Function.prototype.bind = function(obj,arg){
    if (that == null){
        that = this
    }    return function(){
        return that.call(obj,arg);

    }
};function foo() {
    return this.bar;
}

foo = foo.bind({bar:1});
foo = foo.bind({bar:2});var result = foo();
console.log(result);//2

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