目標是隱藏表單，做一些事情并再次取消隱藏表單。例如，對于進度條的這段代碼，我想執行以下操作，但隱藏/取消隱藏不起作用。我可能正在監督一些明顯的事情。
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Progress Bar Demo</title>
<script>
var button;
var count;
var countmax;
var progressbar;
var timerID;
function start(max) {
show_div();
button = document.getElementById("button");
count = 0;
countmax = max;
progressbar = document.getElementById("bar");
progressbar.max = countmax;
timerID = setInterval(function(){update()},10);
show_div();
}//end function
function update() {
button.innerHTML = "Counting to " countmax;
count = count 100;
progressbar.value = count;
if (count >= countmax) {
clearInterval(timerID);
button.innerHTML = "Ready";
progressbar.value = 0;
}//end if
}//end function
function show_div() {
var x = document.getElementById("do_you_see_me?");
if (x.style.display === "none") {
x.style.display = "block";
} else {
x.style.display = "none";
}
}//end function
</script>
</head>
<body>
<div id="do_you_see_me?" style="display: block";>Hi there!</div>
<p>
<button onclick="start(4321)" id="button" style="font-size:18px;">Ready</button><br>
<br>
<progress id="bar" value="0"></progress>
</p>
</body>
</html>
uj5u.com熱心網友回復：
你可以隱藏和取消隱藏它。您的代碼的問題是當您觸發就緒按鈕時，它會自動隱藏然后取消隱藏代碼。這是因為 setInterval() 函式是異步函式。那么你需要在 setInterval() 中呼叫 show_div() 函式。
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Progress Bar Demo</title>
<script>
var button;
var count;
var countmax;
var progressbar;
var timerID;
function start(max) {
hide_div();
button = document.getElementById("button");
count = 0;
countmax = max;
progressbar = document.getElementById("bar");
progressbar.max = countmax;
timerID = setInterval(function()
{
update()
if(count>=countmax)
{
show_div();
}
},10);
}//end function
function update() {
button.innerHTML = "Counting to " countmax;
count = count 100;
progressbar.value = count;
if (count >= countmax) {
clearInterval(timerID);
button.innerHTML = "Ready";
progressbar.value = 0;
}//end if
}//end function
function show_div() {
document.getElementById("do_you_see_me?").style.display="block";
}//end function
function hide_div()
{
document.getElementById("do_you_see_me?").style.display="none";
}
</script>
</head>
<body>
<div id="do_you_see_me?" style="display: block";>Hi there!</div>
<p>
<button onclick="start(4321)" id="button" style="font-size:18px;">Ready</button><br>
<br>
<progress id="bar" value="0"></progress>
</p>
</body>
</html>
我希望這能解決你的問題。
轉載請註明出處，本文鏈接：https://www.uj5u.com/net/480974.html
標籤：javascript 进度条