角度8:对象不支持属性或方法“包含" [英] Angular 8: Object doesn't support property or method 'includes'

问题描述

我正在用angular8构建一个应用程序.我从事angular5/6/7的工作，对于那些应用程序，我没有评论polyfills.ts中存在的导入.对于角度8，它只有3个导入，即classlist.js，web-animation-js和zone.js/dist/zone.我的应用程序在IE中工作正常.但是我开始使用include函数来查看某项是否存在.它在chrome中可以正常工作.在IE中，它抛出Object不支持属性或方法"includes"的错误.

I am building an application in angular8. I worked on angular5/6/7 and for those applications, I uncommented the imports that exist in the polyfills.ts. For angular 8, it has only 3 imports i.e classlist.js, web-animation-js and zone.js/dist/zone. My application is working fine in IE. But I started using the includes function to see if an item exists. It works fine in chrome. In IE it throws Object doesn't support property or method 'includes' error.

推荐答案

includes 是

includes is a function that exist on Array.prototype and String.prototype and it is not supported on IE. You need to use a polyfill like the following:

if (!String.prototype.includes) {
  String.prototype.includes = function(search, start) {
    'use strict';
    if (typeof start !== 'number') {
      start = 0;
    }

    if (start + search.length > this.length) {
      return false;
    } else {
      return this.indexOf(search, start) !== -1;
    }
  };
}

或类似的数组.您还可以检查 Core.js 中的填充

Or similar for Arrays. You can also check Core.js for polyfills

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