如何在Angular 2 cli项目中添加polyfill的代码?
例如,我想使用Mozilla MDN中的以下polyfill :
if (!Array.prototype.includes) {
Object.defineProperty(Array.prototype, 'includes', {
value: function(searchElement, fromIndex) {
if (this == null) { throw new TypeError('"this" is null or not defined'); }
var o = Object(this);
var len = o.length >>> 0;
if (len === 0) { return false; }
var n = fromIndex | 0;
var k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
while (k < len) {
if (o[k] === searchElement) { return …Run Code Online (Sandbox Code Playgroud)