SOURCE

Function.prototype.calls = function() {
   
    let context = arguments[0];
      context.fn = this;
      
      let args = [];
      for (let i = 0, len = arguments.length; i < len; i++) {
          console.log(arguments[i]);
          args.push(arguments[i]);
      }
      
      // 把数组转换为一个伪数组
      let res = context.fn({...args});
      
      delete context.fn;
      return res;
}

let json = {
    name: '23'
}
let fn = function (age) {
    // console.log(this.name + '' + age)
}

fn.calls(json, 12);