JS中filter()数组过滤器的使用

array.filter(function(currentValue,index,arr), thisValue)
//currentValue：当前元素的值
//index：当前元素的下标
//arr：原数组

const school = [
  {
    occupation:"老师",
    age:40
  },
  {
    occupation:"学生",
    age:23
  },{
    occupation:"程序猿",
    age:1
  }
]
var newShool = school.filter(item => item.age > 20)
console.log(newShool);//[ { occupation: '老师', age: 40 }, { occupation: '学生', age: 23 } ]