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);  }