Javascript未捕获的SyntaxError：意外令牌{

Question

Here is my FULL code

function onValueChange(res) {
    If (res) {

    } 
    else {

    }
};

I got error

Uncaught SyntaxError: Unexpected token {

on If (res) {

What is wrong?

Answer 1

There are 2 updates required in your code

1. Update i in If to lowercase.

2. To end function you need to add closing bracket } Also, there is no need for semicolon at the end of function.

    function onValueChange(res) { if (res) { } else { } } 

Answer 2

You can't end functions in javascript like that.

Instead of

end function

you have to use

}

And if has to be lowercase.

Full code:

function onValueChange(res) {
    // lowercase if
    if (res) {

    } 
    else {

    }
}

Answer 3

1. if condition will be lowercase like if not If.
2. ';' mark is not need but it is not responsible for error.

---

function onValueChange(res) 
{
if (res){

 }
else {

 }
}