javascript - Uncaught ReferenceError : invalid left hand assignment

Question

if ((value.length == 12) || (value.length == 9)) {
    if ((value.length == 12)) {

        if (value.substring(0, 2) = "048") { //this doesn't work in the execution
            return true;
        } else {
            return false;
        }
    }
    if ((value.length == 9)) {
        return true;
    } else {
        return false;
    }
} else {
    return false;
}

Answer 1

你需要这样的==。你不能在 if 语句中有一个 =

  if (value.substring(0,2)=="048"){