看完《javascript语言精粹》中的array.sort(comparefn)一节（Page81），很有启发性，于是自己试着实现这样一个通用函数by：无论数组对象为何种类型，调用此函数就能实现人们一般认知意义上的排序。
函数写完，发现没有起作用，debug了好久，最后还是决定求助SF的各位了！
var by = function (name,minor){
return function (a,b){
var objBy = function (a,b){
var aValue,bValue;
aValue = a[name];
bValue = b[name];
if (aValue === bValue){
return typeof minor === 'function' ? minor(a,b) : 0;
}
if (typeof aValue === typeof bValue){
return aValue < bValue ? -1 : 1;
}
return typeof aValue < typeof bValue ? -1 : 1;
}
var generalBy = function (a,b){
if (a === b){
return 0;
}
if (typeof a === 'string' && typeof b === 'string'){
return a.localeCompare(b);
}
if (typeof a === typeof b){
return a < b ? -1 : 1;
}
return typeof a < typeof b ? -1 : 1;
}
if (a && b && typeof a ==='object' && typeof b === 'object'){
return objBy;
}
return generalBy;
}
}
//test
var arry1 = [8,90,10,2,100,34,35,12];
var arry2 = [4,20,10,34,"hello word","杀星","my god","哈哈哈","高级编程","爱情","四货","一个人" ,"大人"];
var arry3 = [{name:"maggie",sex:"famale",age:43},{name:"gino",sex:"male",age:28},{name:"laura",sex:"famale",age:20},{name:"tino",sex:"male",age:25},{name:"amy",sex:"famale",age:27}];
console.log(arry1.sort(by()));
console.log(arry2.sort(by()));
console.log(arry3.sort(by('sex',by('age'))));
这里的by应该返回的是一个比较函数，你这里返回的是一个“返回比较函数”的函数，所以应该改为（注意最后的改动）：
var by = function (name, minor) {
return function (a, b) {
var objBy = function (a, b) {
var aValue, bValue;
aValue = a[name];
bValue = b[name];
if (aValue === bValue) {
return typeof minor === 'function' ? minor(a, b) : 0;
}
if (typeof aValue === typeof bValue) {
return aValue < bValue ? -1 : 1;
}
return typeof aValue < typeof bValue ? -1 : 1;
}
var generalBy = function (a, b) {
if (a === b) {
return 0;
}
if (typeof a === 'string' && typeof b === 'string') {
return a.localeCompare(b);
}
if (typeof a === typeof b) {
return a < b ? -1 : 1;
}
return typeof a < typeof b ? -1 : 1;
}
if (a && b && typeof a === 'object' && typeof b === 'object') {
return objBy(a,b);
}
return generalBy(a,b);
}
}