对 JavaScript 中键值对数组的值求和 [英] Sum values from an array of key-value pairs in JavaScript

问题描述

我定义了一个名为 myData 的 JavaScript 变量，它是一个 new Array，如下所示:

I have defined a JavaScript variables called myData which is a new Array like this:

var myData = new Array(['2013-01-22', 0], ['2013-01-29', 0], ['2013-02-05', 0],
             ['2013-02-12', 0], ['2013-02-19', 0], ['2013-02-26', 0], 
             ['2013-03-05', 0], ['2013-03-12', 0], ['2013-03-19', 0], 
             ['2013-03-26', 0], ['2013-04-02', 21], ['2013-04-09', 2]);

我想知道是否可以对数组中找到的数值求和(例如 0+0+21+2+0 等等)，并且可能有一个变量，结果我可以在数组之外使用脚本标记，因为我有 7 个这种数组对应于一周中的每一天.我想在此基础上进行比较.如果可能的话，这是此类操作的最首选方法吗?

I am wondering if it is possible to sum the number values found in the array (ex. 0+0+21+2+0 and so on) and have probably a variable with the result that I can use outside of the script tag because I have 7 of this kind of arrays corresponding for each of the day in the week. I want to make a comparison afterwards based on that. That is the most preferred method for this kind of actions if is possible?

推荐答案

尝试以下方法

var myData = [['2013-01-22', 0], ['2013-01-29', 1], ['2013-02-05', 21]];

var myTotal = 0;  // Variable to hold your total

for(var i = 0, len = myData.length; i < len; i++) {
    myTotal += myData[i][1];  // Iterate over your first array and then grab the second element add the values up
}

document.write(myTotal); // 22 in this instance

这篇关于对 JavaScript 中键值对数组的值求和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！