js 自带的 sort() 方法

1. 方法概述

   Array的sort()方法默认把所有元素先转换为String再根据Unicode排序，

   sort()会改变原数组，并返回改变（排序）后的数组　。

2. 例子

  2.1　　如果没有提供自定义的方法， 数组元素会被转换成字符串，并返回字符串在Unicode编码下的顺序比较结果

var fruit = ['cherries', 'apples', 'bananas'];fruit.sort(); // ['apples', 'bananas', 'cherries']var scores = [1, 10, 2, 21]; scores.sort(); // [1, 10, 2, 21]// Watch out that 10 comes before 2,// because '10' comes before '2' in Unicode code point order.var things = ['word', 'Word', '1 Word', '2 Words'];things.sort(); // ['1 Word', '2 Words', 'Word', 'word']// In Unicode, numbers come before upper case letters,// which come before lower case letters.

2.2 利用map来排序

// the array to be sortedvar list = ['Delta', 'alpha', 'CHARLIE', 'bravo'];// temporary array holds objects with position and sort-valuevar mapped = list.map(function(el, i) { return { index: i, value: el.toLowerCase() };})// sorting the mapped array containing the reduced valuesmapped.sort(function(a, b) { return +(a.value > b.value) || +(a.value === b.value) - 1;});// container for the resulting ordervar result = mapped.map(function(el){ return list[el.index];});alert(result);

参考 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort

原标题：js 自带的 sort() 方法

关键词：JS