2

我在这上面花了很长时间，但无法在这里发现这个错误。

var test_arr = [['79',0],['8',1],['30', 2],['580',3],['59',4]]本质上，我有一个从函数生成的类型的多元数组。它的行为不像普通数组，因为我的 sort fxnvar sort_arrays = function(a,b) {return a[0]-b[0]};无法正确排序数组值。

我试图确保我有一个实际的数组，并且我没有调用替代排序方法。

因此：

console.log(arr_test.sort(sort_arrays));

给出：[[8,1],[30,2],[59,4],[79,0],[580,3]]

但是，在我的 fxn 上调用它，

console.log(input_kde.sort(sort_arrays));

，给出：[...,[580, 0.002],[59,0.001]]

在尝试生成一些可打印的输出时，我调用.toString了我的结果，并得到了正确排序的输出，这只会加深我的困惑。

我尝试过显式类型转换parseFloat(a[0])但无济于事。

我还尝试确认这确实是一个数组：

console.log(typeof(input_kde)); //#> object
console.log(input_kde.constructor); //#> function Array() { [native code] }
console.log(input_kde instanceof Array); //#> true

此外， input_kde[0] 是一个数组， input_kde[0][0] 是一个数字

console.log(input_kde[0] instanceof Array); //#> true
console.log(typeof(input_kde[0][0])); //#> number

我错过了什么？

编辑2

var input_kde = [[22,0.0017095221275204712],[24,0.001712291003699343],[28,0.001716821328044571],[307,0.0009792081392809542],[33,0.0017205981968323918],[34,0.0017211029300063302],[341,0.0010085669284820244],[35,0.0017215244128879188],[387,0.0010558490092862406],[4,0.0016696065108796395],[40,0.0017223891946762664],[448,0.0010667514507313397],[491,0.0010124434821844265],[519,0.0009480280002363708],[580,0.0007465298453339767],[59,0.0017073128314605394]]
4

3 回答 3

0 
var input_kde = [[22,0.0017095221275204712],[24,0.001712291003699343],[28,0.001716821328044571],[307,0.0009792081392809542],[33,0.0017205981968323918],[34,0.0017211029300063302],[341,0.0010085669284820244],[35,0.0017215244128879188 ],[387,0.0010558490092862406],[4,0.0016696065108796395],[40,0.0017223891946762664],[448,0.0010667514507313397],[491,0.0010124434821844265],[519,0.0009480280002363708],[580,0.0007465298453339767],[59,0.0017073128314605394]]



    //测试运行
    var sorted=input_kde.sort(function(a,b){return a[0]-b[0]});
    警报（排序）；

我找不到任何问题！！！！

实际上，为什么您的代码在第二次运行中未能返回正确的值是因为您sort_arrays已经使用前一个变量设置了变量！因此，失败了！

于 2012-07-23T21:13:06.223 回答
0

它似乎工作正常 http://jsfiddle.net/w8T32/

var test_arr = [['79',0],['8',1],['30', 2],['580',3],['59',4]];
test_arr.sort(function(a,b){
    return a[0] -b[0];
});
console.log(test_arr)​

输出类似于

[['8',1], ['30',2], ['59', 4], ['79',0], ['580', 3]]

要考虑的一件事是 sort 没有记录的返回值（它修改了数组），但您似乎正在使用它。更改您的代码，使其不依赖于返回值，看看是否有任何区别

于 2012-07-23T20:39:09.593 回答
0

我可能只是在这里在黑暗中拍摄，但你那里有混合类型（字符串和整数）？

于 2012-07-23T20:32:28.880 回答