sort会修改原数组
利用数组api ——> sort来进行排序
var person = [{name:"Rom",age:12},{name:"Bob",age:22},{name:"Ma",age:5},{name:"Tony",age:25}]
person.sort((a,b)=>{ return a.age-b.age})//升序
person.sort((a,b)=>{ return b.age-a.age})//降序
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sort会修改原数组
var person = [{name:"Rom",age:12},{name:"Bob",age:22},{name:"Ma",age:5},{name:"Tony",age:25}]
person.sort((a,b)=>{ return a.age-b.age})//升序
person.sort((a,b)=>{ return b.age-a.age})//降序
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