通过for循环连接字符串 | 通过for循环连接字符串

本文介绍了通过for循环连接字符串的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试通过for loop连接字符串，但是我正在接收NaNs.我要实现的是获得一个串联的字符串Div #0, Div #1, Div #2, Div #3,.

I'm trying to concatenate strings via for loop but i'm receiving NaNs. What i want to achieve is to get one concatenated string Div #0, Div #1, Div #2, Div #3,.

var divLength = $('div').length;

var str = '';
for(var i=0; i<divLength; i++){
  var str =+ "Div #" + [i] + ", ";
  console.log(str);
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div></div>
<div></div>
<div></div>
<div></div>

推荐答案

不要在var str循环内声明新的str变量.重用您在循环外部声明的代码.也做+=

Don't declare a new str variable inside the loop with var str. Reuse the one you declare outside the loop. Also do +=

var divLength = $('div').length;

var str = '';
for(var i=0; i<divLength; i++){
  str += "Div #" + i + ", ";
  console.log(str);
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div></div>
<div></div>
<div></div>
<div></div>

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