javascript - 如何在JavaScript / jQuery中查找数组是否包含特定字符串？ [重复](How to find if an array contains a specific string in JavaScript/jQuery? [duplicate])

Question

This question already has an answer here:

(这个问题已经在这里有了答案：)

• How do I check if an array includes a value in JavaScript?

  (如何检查数组是否在JavaScript中包含值？)

  47 answers

  (47个答案)

Can someone tell me how to detect if "specialword" appears in an array?

(有人可以告诉我如何检测"specialword"出现在数组中吗？)

Example:

(例：)

categories: [
    "specialword"
    "word1"
    "word2"
]

  ask by Cofey translate from so

Answer 1

You really don't need jQuery for this.

(您真的不需要jQuery。)

var myarr = ["I", "like", "turtles"];
var arraycontainsturtles = (myarr.indexOf("turtles") > -1);

Hint : indexOf returns a number, representing the position where the specified searchvalue occurs for the first time, or -1 if it never occurs

(提示 ：indexOf返回一个数字，表示指定的搜索值首次出现的位置；如果从未出现，则返回-1)

or

(要么)

function arrayContains(needle, arrhaystack)
{
    return (arrhaystack.indexOf(needle) > -1);
}

It's worth noting that array.indexOf(..) is not supported in IE < 9 , but jQuery's indexOf(...) function will work even for those older versions.

(值得注意的是IE <9不支持 array.indexOf(..) ，但jQuery的indexOf(...)函数即使在那些较旧的版本中也可以使用。)