数组和json的排序(1)
1.不传参数,将不会按照数值大小排序,按照字符编码的顺序进行排序;
var arr = ['General','Tom','Bob','John','Army']; var resArr = arr.sort(); console.log(resArr);//输出 ["Army", "Bob", "General", "John", "Tom"] var arr2 = [30,10,111,35,1899,50,45]; var resArr2 = arr2.sort(); console.log(resArr2);//输出 [10, 111, 1899, 30, 35, 45, 50]
2.传入参数,实现升序,降序;
var arr3 = [30,10,111,35,1899,50,45]; arr3.sort((a,b)=>{ return a - b; }) console.log(arr3);//输出 [10, 30, 35, 45, 50, 111, 1899] var arr4 = [30,10,111,35,1899,50,45]; arr4.sort((a,b)=>{ return b - a; }) console.log(arr4);//输出 [1899, 111, 50, 45, 35, 30, 10]
3.根据数组中的对象的某个属性值排序;
var arr5 = [{id:10},{id:5},{id:6},{id:9},{id:2},{id:3}]; arr5.sort(function(a,b){ return a.id - b.id }) console.log(arr5); //输出新的排序 // {id: 2} // {id: 3} // {id: 5} // {id: 6} // {id: 9} // {id: 10}
4.根据数组中的对象的多个属性值排序,多条件排序;
var arr6 = [{id:10,age:2},{id:5,age:4},{id:6,age:10},{id:9,age:6},{id:2,age:8},{id:10,age:9}]; arr6.sort(function(a,b){ if(a.id === b.id){//如果id相同,按照age的降序 return b.age - a.age }else{ return a.id - b.id } }) console.log(arr6); //输出新的排序 // {id: 2, age: 8} // {id: 5, age: 4} // {id: 6, age: 10} // {id: 9, age: 6} // {id: 10, age: 9} // {id: 10, age: 2}