js对数组按顺序排序

console.log("------默认排序(ASCII字符排序)------");
var arr = [,,,,];
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 = [,,,,];
arr1.sort(function(a,b){  //自定义函数排序
    var a1= parseInt(a);
    var b1= parseInt(b);
    if(a1<b1){
        return -;
    }else if(a1>b1){
        return ;
    }
    return ;
});
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:"",name:"lee",age:});
arr2.push({date:"",name:"wang",age:});
arr2.push({date:"",name:"huang",age:});
arr2.push({date:"",name:"keke1",age:});
arr2.push({date:"",name:"keke2",age:});
arr2.push({date:"",name:"keke3",age:});
arr2.push({date:"",name:"keke4",age:});
arr2.push({date:"",name:"keke5",age:});
arr2.sort(function(a,b){
    if(a.age<b.age){
        return -;
    }else if(a.age>b.age){
        return ;
    }
    return ;
});
for(var i=;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 ;
    }else if(a.date>b.date){
        return -;
    }else{
        if(a.age<b.age){
            return -;
        }else if(a.age>b.age){
            return ;
        }
        return ;
    }
});
for(var i=;i<arr2.length;i++){
    console.log(arr2[i].date + ", " + arr2[i].name + ", " + arr2[i].age);
}