javascript - Array deletes any specified number in the array

Question

Need to delete any specified number in [1,2,3,4,5], how to do it?
For example, if you want to delete 2, the result returned is [1,3,4,5]

Answer 1

var arr=[1,2,3,4,5];
for(var i=0,len=arr.length;i<len;i++){
    if(arr[i]===2){
        arr.splice(i,1)
    }
}

However, it is recommended to use the iterative method

var arr=[1,2,3,4,5];
arr.filter(function(item){return item!==2})
//es6写法
arr.filter(item =>item!==2)

Answer 2

arr.splice(1,1) //[1, 3, 4, 5] Delete a value with a starting subscript of 1, a length of 1, and len set to 1. If it is 0, the array remains unchanged

Answer 3

var e = [1,2,3,4,5]
x = Math.ceil((e.length - 1) * Math.random())
console.log(x)
e.splice(x, 1)
console.log(e)