在JavaScript中汇总存储在数组中的数字 [英] summing numbers stored in an array in JavaScript

问题描述

我想总结存储在JavaScript对象中的数字列表。使用以下代码创建和更新对象：

I want to sum a list of numbers stored in a JavaScript object. The object is created and updated using this code:

var myscore = $('input[name="Points1"]').val();
scorelist = JSON.parse(localStorage.getItem(playerName + 'scorelist') || '[]');
        scorelist.push(myscore);
        localStorage.setItem(playerName + 'scorelist', JSON.stringify(scorelist));
        $('div.scorecolumn', column).html("Score: <br>" + scorelist.join('<br>') + "<br>");

基本上我当时采用列中的任何内容，解析它，添加 myscore ，将其字符串化，使用< br> 连接每个元素，并将列表写入scorecolumn。数字列表保存为对象。我的目标是在任何给定的时间总结对象中的所有数字。

Basically I take whatever is in the column at the time, parse it, add myscore, stringify it, join each element with a <br> and write the list to the scorecolumn. The list of numbers is saved as an object. My goal is to sum up all the numbers in the object at any given time.

这个脚本在一个传递一堆参数的函数内部，这就是为什么一些变量在这里看起来未定义。

This script is inside of a function that passes in a bunch of parameters which is why some variables look undefined here.

任何帮助都将不胜感激！谢谢

Any help would be greatly appreciated! Thanks

更新：

var nicTotalScore = nicScoreList.reduce(function(score, total) {
        return total + score;   
    }, 0);
    console.log(nicTotalScore); //12120
    console.log(nicScoreList); //["12", "12"]

更新：
如果得分字段提交时留空，空字符串而不是分数。当reduce方法通过数组时，这将注册为0。这并不影响总数，但是比方说，例如，我想找到平均分数，它会抛弃它。有什么想法？谢谢

UPDATE: If the score field is left blank when submitted, an empty string " " instead of a score. this is registering as a 0 when the reduce method goes through the array. This doesnt affect the total, but say, for example, i wanted to then find the average score, it throws it off. any ideas there? thanks

推荐答案

如果你 push（）到得分列表，我很想说它可能是数组。

If you push() to scorelist, I'd be tempted to say it's likely an Array.

您可以使用 reduce（）。

var total = scorelist.reduce(function(total, score) {
    return total + +score;
}, 0);

这篇关于在JavaScript中汇总存储在数组中的数字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！