通过for循环连接字符串 [英] Concatenate string through for loop

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>

这篇关于通过for循环连接字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！