Javascript 即不支持“包含”方法
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/31221341/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
ie does not support 'includes' method
提问by Onur Emrecan ?zcan
I have been working on a project and developing a JavaScript framework. The original code is about 700 lines so I only pasted this line. The includes method doesn't work on Internet Explorer. Is there any solution for this?
我一直在做一个项目并开发一个 JavaScript 框架。原始代码大约有 700 行，所以我只粘贴了这一行。include 方法在 Internet Explorer 上不起作用。有什么解决办法吗？
var row_cells = tbl_row.match(/<td[\s\S]*?<\/td>/g);
row.Cells = new Array();
if (onRowBindFuncText != null) { /*Fonksyon tan?mlanma??sa daha h?zl? ?al??*/
var cellCount = 0;
for (i = 0; i < row_cells.length; i++) {
var cell = new Cell();
$.each(this, function (k, v) {
if ((row_cells[i]+"").includes("#Eval(" + k + ")")) {
cell.Keys.push(new Key(k,v));
...Code goes on
...代码继续
回答by alessandro
Because it's not supported in IE, it is not supported also in Opera (see the compatibility table), but you can use the suggested polyfill:
因为 IE 不支持它，Opera 也不支持它（请参阅兼容性表），但您可以使用建议的polyfill：
Polyfill
This method has been added to the ECMAScript 2015 specification and may not be available in all JavaScript implementations yet. However, you can easily polyfill this method:
填充物
此方法已添加到 ECMAScript 2015 规范中，可能尚未在所有 JavaScript 实现中可用。但是，您可以轻松地填充此方法：
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;
}
};
}
回答by Sunho Hong
@Infer-on shown great answer, but it has a problem in a specific situation. If you use for-in loop it will return includes "includes" function you added.
@Infer-on 给出了很好的答案，但它在特定情况下有问题。如果您使用 for-in 循环，它将返回您添加的包含“包含”功能。
Here is another pollyfill.
这是另一个pollyfill。
if (!Array.prototype.includes) {
Object.defineProperty(Array.prototype, "includes", {
enumerable: false,
value: function(obj) {
var newArr = this.filter(function(el) {
return el == obj;
});
return newArr.length > 0;
}
});
}
回答by Patrick Duncan
You could just use .search() > -1 which behaves in the exact same way. http://www.w3schools.com/jsref/jsref_search.asp
您可以使用 .search() > -1 ，其行为方式完全相同。 http://www.w3schools.com/jsref/jsref_search.asp
if ((row_cells[i]+"").search("#Eval(" + k + ")") > -1) {
回答by patrickbadley
This Selected answer is for String, if you are looking for 'includes' on an array, I resolved my issue by adding the following to my polyfills.ts file:
This Selected answer is for String，如果您正在寻找数组上的“包含”，我通过将以下内容添加到我的 polyfills.ts 文件来解决我的问题：
import 'core-js/es7/array';
回答by mvermand
This is a polyfill for TypeScript projects, taken from https://developer.mozilla.org/nl/docs/Web/JavaScript/Reference/Global_Objects/Array/includesand modified to be valid TypeScript:
这是 TypeScript 项目的 polyfill，取自https://developer.mozilla.org/nl/docs/Web/JavaScript/Reference/Global_Objects/Array/includes并修改为有效的 TypeScript：
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');
}
const o = Object(this);
// tslint:disable-next-line:no-bitwise
const len = o.length >>> 0;
if (len === 0) {
return false;
}
// tslint:disable-next-line:no-bitwise
const n = fromIndex | 0;
let k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
while (k < len) {
if (o[k] === searchElement) {
return true;
}
k++;
}
return false;
}
});
}
回答by user11374562
if (fullString.indexOf("partString") >= 0) {
//true
} else {
//false
}
回答by mohan mu
var includes = function(val, str) {
return str.indexOf(val) >= 0;
};
