Javascript 如何检查列表是否包含javascript中的字符串?

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/36782940/
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

提示:将鼠标放在中文语句上可以显示对应的英文。显示中英文
时间:2020-08-23 19:32:46  来源:igfitidea点击:

How to check if a list contains a string in javascript?

javascript

提问by Gallaxhar

How can I test if the string "Orange" without quotes, exists in a list such as the one below, using javascript?

如何使用javascript测试不带引号的字符串“Orange”是否存在于如下列表中?

var suggestionList = ["Apple", "Orange", "Kiwi"];

回答by ippi

indexOf()is the default to use in such cases.

indexOf()是在这种情况下使用的默认值。

if( suggestionList.indexOf("Orange") > -1 ) {
    console.log("success");
}

.indexOf() returns the position in the array (or string) of the found element. When no elements are found it returns -1.

.indexOf() 返回找到的元素在数组(或字符串)中的位置。当没有找到元素时,它返回-1

Things to consider:

需要考虑的事项:

  • It willreturn 0 if the first object matches, so you cannotjust cast to boolean.
  • Since es2016 you can use suggestionList.includes('Kiwi');which will return a boolean directly. (Does not work in internet explorer, but works in IEdge)
  • includes polyfill for older browsers: https://babeljs.io/docs/usage/polyfill/
  • 如果第一个对象匹配,这样你就返回0不能只投为布尔值。
  • 从 es2016 开始,您可以使用suggestionList.includes('Kiwi');which 将直接返回一个布尔值。(在 Internet Explorer 中不起作用,但在 IEdge 中有效)
  • 包括旧浏览器的 polyfill:https: //babeljs.io/docs/usage/polyfill/