js总结之模拟call,apply

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/*
 * @Author: changchang
 * @github: https://github.com/changchangge
 * @LastEditors: changchang
 * @Date: 2019-02-27 16:50:58
 * @LastEditTime: 2019-02-27 16:54:29
 */
Function.prototype.callTest = function (context) {
  /**
   * @description: 实现一个call函数
   */
  var context = context || window;
  context.fn = this;
  var args = [];
  for (var i = 1; i < arguments.length; i++) {
    args.push("arguments[" + i + "]");
  }
  var result = eval("context.fn(" + args + ")")
  delete context.fn;
  return result;
}

Function.prototype.applyTest = function (context, arr) {
  /**
   * @description: 实现一个bind函数
   */
  var context = context || window;
  context.fn = this;
  var result;
  if (!arr) {
    result = context.fn();
  } else {
    var args = [];
    for (var i = 0; i < arr.length; i++) {
      args.push("arr[" + i + "]");
    }
    result = eval("context.fn(" + args + ")")
  }
  delete context.fn;
  return result;
}
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