javascript排序功能排序错误 [英] javascript sort function sorting wrong

问题描述

您好，我有一个文本框，其值类似于

Hello I have a textbox having values like

<input type="hidden" value="2,1,4,5,3,6,7,8,9,10,11,12" class="sortvalues" id="1_1_parent">

现在我要获取此文本框的值，想要将值拆分为数组，然后最后需要排序的数组.

Now what I want to take the value of this textbox, want to split the values to array and then as last result I need a sorted array.

我做了什么.

 allsortedValues =  $(".sortvalues").val();
 allsortedValues = allsortedValues.split(",");
 allsortedValues = allsortedValues.sort();

当我检查数组

 console.log(allsortedValues);

它显示

  1,10,11,12,2,3,4,5,6,7,8,9

将数组排序为1, 10, 11, 12, 2.....

我什至用过

allsortedValues = allsortedValues.split(",").map(function(x){return parseInt(x)});

在应用排序之前，在其他情况下，我什至使用了parseInt之类的

before applying sort and in other case I have even used parseInt like

for(var i = 0; i < allsortedValues.length; i++) {

   allsortedValues[i] = parseInt(allsortedValues[i]);
}

在应用排序之前，但在所有情况下结果都是相同的.会有人指导我在做什么错吗?

before applying sort but in all cases result is same. Will some one guide what am I doing wrong?

推荐答案

您必须传递一个将字符串转换为数字的比较器函数:

You'll have to pass in a comparator function that converts the strings to numbers:

allsortedvalues = allsortedvalues.sort(function(a,b) {
  return (+a) - (+b);
});

如果您的某些数组条目可能不是格式正确的数字，那么您的比较器将不得不变得更加复杂.

If there's a chance that some of your array entries aren't nicely-formatted numbers, then your comparator would have to get more complicated.

构造(+a)涉及一元+运算符，如果a已经是数字，则该运算符不执行任何操作.但是，如果a不是 一个数字，则+a的结果将是解释为 时的a值，或者是NaN .通过将字符串检查并解析为数字的字符串表示形式，可以很明显地将字符串解释为.布尔值将转换为false -> 0和true -> 1.值null变为0，undefined为NaN.最后，对象引用通过调用其valueOf()函数解释为数字，否则调用NaN.

The construction (+a) involves the unary + operator, which doesn't do anything if a is already a number. However if a is not a number, the result of +a will be either the value of a when interpreted as a number, or else NaN. A string is interpreted as a number in the obvious way, by being examined and parsed as a string representation of a number. A boolean value would be converted as false -> 0 and true -> 1. The value null becomes 0, and undefined is NaN. Finally, an object reference is interpreted as a number via a call to its valueOf() function, or else NaN if that doesn't help.

如果愿意，等同于使用Number(a)中的Number构造函数.它的作用与+a完全相同.我是个懒惰的打字员.

It's equivalent to use the Number constructor, as in Number(a), if you like. It does exactly the same thing as +a. I'm a lazy typist.

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