4-3数组的排序

1.升序

语法：arr.sort((a,b)=>{
return a-b;
}）

  var arr = [4,7,1,3,14]; //[1,3,4,7,14]
  var res = arr.sort((a,b)=>{
            return a-b;
        })
        console.log(res)//[1,3,4,7,14]

2.降序

语法： arr.sort((a,b)=>{
return b-a
})

 var arr = [4,7,1,3,14]; 
  var res = arr.sort((a,b)=>{
            return b-a;
        })
        console.log(res)//[14,7,4,3,1]

排序例子

<script>
        var students = [
            {name:"zhang",age:20},
            {name:"li",age:18},
            {name:"wang",age:9},
            {name:"chen",age:14},
        ]
        /* 
        根据年龄升序
        根据年龄降序
         */
         var result = students.sort((a,b)=>{
             return a["age"]-b["age"]
         })
         console.log(result)
    </script>

    <button id="like">通过好评排序</button>
    <button id="price">通过价格排序</button>
<script>
        var like = document.getElementById("like");
        var sales = [
            { name: "张三", like: 60, distance: 1000, price: 10 },
            { name: "张三", like: 30, distance: 100, price: 40 },
            { name: "张三", like: 20, distance: 500, price: 6 },
        ]
        /* 升序 */
        function addOrder(arr, value) {
            if (Array.isArray(arr)) {
                var res = arr.sort((a, b) => {
                    return a[value] - b[value];
                })
                return res;
            }else{
                return null;
            }
        }
        like.onclick = function () {
            console.log(addOrder(sales, "like"))
        }
        price.onclick = function () {
            console.log(addOrder(sales, "price"))
        }
    </script>