[Array] js数组的删除操作

方法一 切割 splice

清空数组

let arr = [1, 2, 3, 4];
        console.log("test:", arr)
        arr.splice(0, arr.length);
        console.log("test:", arr)

删除数组元素

console.log("--------------splice-----------------------")
        var ary = [1, 2, 3, 4];
        console.log("删除数组元素-1-before:", ary)
        ary.splice(0, 1);
        console.log("删除数组元素-1-after:", ary)
        console.log("删除数组元素-1-after:", ary[0])

方法二 删除 delete

后果会留个坑
删除数组元素

console.log("--------------delete-----------------------")
       let arr2 = [1, 2, 3, 4];
       console.log("删除数组元素-2-before:", arr2)
       delete arr2[1]
       console.log("删除数组元素-2-after:", arr2)
       console.log("删除数组元素-2-after:", arr2[1])