[英]Javascript Timer returns NaN
I'm trying to make a timer in javascript, a very simple one. 我正在尝试使用javascript做一个计时器,这是一个非常简单的计时器。 I wrote a bit of code that should have worked afaik, yet it doesn't, so I did something wrong. 我写了一些应该可以使用afaik的代码,但是没有,所以我做错了。 I cant figure out what I did wrong. 我不知道我做错了什么。 after a second it changes the value of the textbox to NaN. 一秒钟后,它将文本框的值更改为NaN。
Here is the code: 这是代码:
var timeractive = false;
var tijd = 0;
function startTimer() {
timeractive = true;
if (timeractive == true) {
var ticker = setInterval(function(){tijdTimer()},1000);
}
}
function stopTimer() {
timeractive = false;
}
function resetTimer() {
if (timeractive == true) {
alert("Timer is actief.");
} else {
alert("Timer is inactief.");
}
}
function tijdTimer() {
var tijd = tijd + 1;
//var tijdstring = tijd.toString();
document.getElementById("tijdveld").value=tijd.toString();
}
Does someone here know whats wrong? 这里有人知道怎么了吗?
Thanks in advance. 提前致谢。
var tijd = tijd + 1;
// ^^^
You are creating a new, local variable which will have the default value of undefined
. 您正在创建一个新的局部变量,其默认值为undefined
。
Remove the var
. 删除var
。
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