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默認排序方法

默認排序是根據UniCode碼的順序排序

var arr = ['afk','hello','body','script'];
arr.sort();
//['afk','body','hello','script']

升序排列

function sortNum(a,b) {
 rerturn a - b;
}
var arr = [12,222,666,888,20,8];
arr.sort(sortNum);
//[8,12,20,222,666,888]

降序排列

function sortNum(a,b) {
 return b - a; 
}
var arr = [12,222,666,888,20,8];
arr.sort(sortNum);
//[888,666,222,20,12,8]

按照數組對象的某個屬性值排序

var arr = {
 {name:leemo, age:21},
 {name:chuchu, age:22},
 {name:qiyue, age:1}
}
//根據age排序
function compare(age){
 return function(a,b){
 return a[age] - b[age];
 }
}
arr.sort(compare('age'));