js sort 排序方法

// 如果我们想要给任何包含简单值的数组排序，必须要做更多的工作var m = ['aa','bb','a',4,8,15,16,23,42];m.sort(function(a,b){if(a === b){return 0;}if(typeof a === typeof b){return a < b ? -1 : 1;}return typeof a < typeof b ? -1 : 1;})/*** 如果有一个更智能的比较函数,我们可以使对象数组排序。** by函数接受一个成员名称字符串作为参数* 并返回一个可以用来包含该成员的对象数组进行排序的比较函数*/var by = function(name){return function(o,p){var a , b;if(typeof o === 'object' && typeof p === 'object' && o && p){a = o[name];b = p[name];if(a === b){return 0;}if (typeof a === typeof b){return a < b ? -1 : 1;}return typeof a < typeof b ? -1 : 1;} else{throw {name : 'Error',message : 'Expected an object when sorting by' + name};}}}var s = [{ first : 'Joe', last :'Besser'},{ first : 'Moe', last :'Howard'},{ first : 'Joe', last :'Derita'},{ first : 'Shemp', last :'Howard'},{ first : 'Larry', last :'Fine'},{ first : 'Currly', last :'Howard'}]// 如果你想基于多个键值进行排序，你需要再次做更多的工作var by =  function (name , minor){return  function (o,p){var a, b;if(o && p && typeof o === 'object' && typeof p ==='object'){a = o[name];b = p[name];if(a === b){return typeof minor === 'function' ? minor(o,p) : 0;}if(typeof a === typeof b){return a < b ? -1 : 1;}return typeof a < typeof b ? -1 : 1;} else{throw {name : 'Error',message : 'Expected an object when sorting by ' + name}}}}s.sort(by('last',by('first')));