Javascript call和apply的模拟实现

function bar(name,age){
    this.hobby = ‘shopping‘;
    console.log(this.value);
    console.log(this.hobby);
    console.log(name);
    console.log(age);
}
bar.prototype.friend = ‘kevin‘;
var obj = {
    hobby: ‘gamming‘
}

var hah = bar.call(obj,‘jack‘,18);

Function.prototype.calls = function(){
    var dir = arguments[0];
    var args = [];
    for(var i = 1; i < arguments.length; i++){
        args.push(arguments[i])
    };
    dir.pau = this;
    // 这里用到了ES6的新特性，不好
    dir.pau(...args);
    delete dir.pau;
}

 eval(‘dir.pau(‘ + args +‘)‘);
 delete dir.pau;