Javascript 通过 for 循环连接字符串
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Concatenate string through for loop
提问by nehel
I'm trying to concatenate strings via for loopbut i'm receiving NaNs. What i want to achieve is to get one concatenated string Div #0, Div #1, Div #2, Div #3,.
我正在尝试通过连接字符串，for loop但我收到NaNs. 我想要实现的是获得一个连接的字符串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>回答by Red Mercury
Don't declare a new strvariable inside the loop with var str. Reuse the one you declare outside the loop. Also do +=
不要str在循环内声明一个新变量var str。重用你在循环外声明的那个。也做+=
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>回答by Sebastian D'Agostino
Besides the selected answer, you could do this with a forEachif you have a list of stuff to put inside those divs:
除了选定的答案之外，forEach如果您有一个要放入其中的内容列表，则可以使用 a 执行此操作divs：
let string = '';
items.forEach(item => string += '<div>'+ item.description + '</div>');
