javascript - 如何用哈希对该数组进行排序？

Question

可能重复：
如何对 javascript 对象数组进行排序？

我的输出如下所示：

[ { value: 1, count: 1 }, { value: 2, count: 2 } ]

我需要遍历数组中的哈希，然后返回具有最高计数的值数。看起来很简单，但我有点难过。我尝试使用单独的数组来保存两组值，但我想不出最好的方法。

Answer 1

你可以这样做：

var a = [{
    value: 1,
    count: 1
}, {
    value: 2,
    count: 2
}, {
    value: 7,
    count: 8
}, {
    value: 5,
    count: 0
}, {
    value: 10,
    count: 3
}];

// sorting using a custom sort function to sort the 
// greatest counts to the start of the array
// take a look here: http://www.w3schools.com/jsref/jsref_sort.asp
// to understand how the custom sort function works
// better references can be found 
// here: http://es5.github.com/#x15.4.4.11
// and here: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/sort
a.sort( function( v1, v2 ){
    return v2.count - v1.count;
});

for ( var i in a ) {
    console.log( a[i] );
}

// the greatest one is the first element of the array
var greatestCount = a[0];

console.log( "Greatest count: " + greatestCount.count );