js对数组按顺序排序

console.log("------默认排序(ASCII字符排序)------");
var arr = [1,2,55,12,88];
arr.sort();  //ASCII字符代码从小到大排序
console.log(arr.toString());  

console.log("------自定义函数排序------");
var arr1 = [1,2,55,12,88];
arr1.sort(function(a,b){  //自定义函数排序
    var a1= parseInt(a);
    var b1= parseInt(b);
    if(a1<b1){
        return -1;
    }else if(a1>b1){
        return 1;
    }
    return 0;
});
console.log(arr1.toString());  

console.log("------反转数组------");
var reArr = arr1.reverse();  //将数组中元素的顺序倒转
console.log(reArr.toString());  

console.log("------按年龄正序排序------");
var arr2 = [];
arr2.push({date:"20130101",name:"lee",age:2});
arr2.push({date:"20130101",name:"wang",age:12});
arr2.push({date:"20130202",name:"huang",age:30});
arr2.push({date:"20130202",name:"keke1",age:14});
arr2.push({date:"20130202",name:"keke2",age:31});
arr2.push({date:"20130303",name:"keke3",age:56});
arr2.push({date:"20130303",name:"keke4",age:22});
arr2.push({date:"20130303",name:"keke5",age:32});
arr2.sort(function(a,b){
    if(a.age<b.age){
        return -1;
    }else if(a.age>b.age){
        return 1;
    }
    return 0;
});
for(var i=0;i<arr2.length;i++){
    console.log(arr2[i].date + ", " + arr2[i].name + ", " + arr2[i].age);
}  

console.log("------按date倒序，age正序排序------");
arr2.sort(function(a,b){
    if(a.date<b.date){
        return 1;
    }else if(a.date>b.date){
        return -1;
    }else{
        if(a.age<b.age){
            return -1;
        }else if(a.age>b.age){
            return 1;
        }
        return 0;
    }
});
for(var i=0;i<arr2.length;i++){
    console.log(arr2[i].date + ", " + arr2[i].name + ", " + arr2[i].age);
}