尝试添加一个数组，但结果返回NaN [英] Trying to add up an array, but result returns NaN

问题描述

所以我有一个名为hoursString的字符串，看起来像

  4.3 | 2.4 | 3.4 | 3.0 | 2.64 | 3.0 | 1.0 | 0.0 | 2.6 | 3.4 | 
  

我将字符串拆分为一个数组，我试图做的是将所有数字加起来将其返回到divtest中的html页面。

JAVASCRIPT：

  var hours = hoursString.split（| ）; 
 
 var total = 0; 
 for（var i = 0; i  {
 total + = hours [i]; 
} 
 document.getElementById（test）。innerHTML = total; 
  

结果是NaN。有人能告诉我我做错了什么吗？
Thanks！

解决方案

4.3 | 2.4 | 3.4 | 3.0 | 2.64 | 3.0 | 1.0 | 0.0 | 2.6 | 3.4 |


删除最后一个|，split会在数组的末尾添加一个空字符串， NaN和NaN +的数值计算结果为NaN b
$ b 编辑：是的，parseFloat也是必须的，否则结果将是一个字符串而不是NaN

So I have a string called hoursString that looks like

4.3|2.4|3.4|3.0|2.64|3.0|1.0|0.0|2.6|3.4|

I split the string into an array and what I am trying to do is add up all the numbers and return it to the html page in the div "test".

JAVASCRIPT:

var hours=hoursString.split("|");

    var total=0;
    for (var i=0;i<hours.length;i++)
        {
        total += hours[i];
        }
    document.getElementById("test").innerHTML=total;

The result is NaN. Can someone tell me what I am doing wrong? Thanks!

解决方案

4.3|2.4|3.4|3.0|2.64|3.0|1.0|0.0|2.6|3.4|

remove the last |, split will otherwise add an empty string at the end of the array which will give NaN and NaN + number evaluates to NaN

edit: and yes, parseFloat is necessary too, otherwise the result will be a string instead of NaN

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