js 数组 大小排序方法

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 ("error");

   }

 }

}

 

 

 

var employees=[]

employees[0]={name:"George", age:32, retiredate:"March 12, 2014"}

employees[1]={name:"Edward", age:17, retiredate:"June 2, 2023"}

employees[2]={name:"Christine", age:58, retiredate:"December 20, 2036"}

employees[3]={name:"Sarah", age:62, retiredate:"April 30, 2020"}

 

employees.sort(by("age"));

 

 

比较两个参数时下面

//by函数接受一个成员名字符串和一个可选的次要比较函数做为参数

//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

//当o[age] 和 p[age] 相等时，次要比较函数被用来决出高下

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{

     thro("error");

   }

 }

}

 

employees.sort(by('age',by('name')));