Javascript如何获取字符串的前三个字符 [英] Javascript How to get first three characters of a string

问题描述

这可能与以前的主题重复，但我找不到我真正需要的东西。

This may duplicate with previous topics but I can't find what I really need.

我想获得字符串的前三个字符。例如：

I want to get a first three characters of a string. For example:

var str = '012123';
console.info(str.substring(0,3));  //012

我想要输出这个字符串'012'，但我不想用subString或类似的东西，因为我需要使用原始字符串来追加更多字符'45'。使用子字符串，它将输出01245，但我需要的是01212345。

I want the output of this string '012' but I don't want to use subString or something similar to it because I need to use the original string for appending more characters '45'. With substring it will output 01245 but what I need is 01212345.

推荐答案

var str = '012123';
var strFirstThree = str.substring(0,3);

console.log(str); //shows '012123'
console.log(strFirstThree); // shows '012'

现在您可以访问这两个。

Now you have access to both.

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