Javascript拼接方法问题

Question

I have a problem with the splice method. In the script below, if I set the second argument of splice to '0' it crashes my browser. If I set to any other value that is greater than '0' it works just fine.

Why is this happening?

Thanks,

And the code:

function f (x) {

    var d = x.toString().split("");

    for (i=0; i<d.length; i++){
        if (Number(d[i])%2===0){
            d.splice(i, 0, "drum");
        }
    } 

    return d;
};

Answer 1

Its an infinite loop and each time drum is getting inserted to array increasing its length.

Splice() insert the item to array so you are inserting new item.

first loop:

• Array is 8,8,8
• i is 0 //d[0] is 8
• Condition if (Number(d[i])%2===0) is true
• drum inserted Now Array is drum,8,8,8

second loop:

• Array is drum,8,8,8
• i is 1 //d[i] is 8
• Condition if (Number(d[i])%2===0) is true
• drum inserted Now Array is drum,drum,8,8,8

and it goes on....