我正在生成素数，它将一直延迟到完成。有没有办法我可以做到这一点，所以它不会滞后。例如，如果你最多生成1000，我希望它在计算完数字时立即吐出答案。
HTML：
<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<title>Prime Generator</title>
<h1>
Welcome to my online prime generator!
<h1>
<style>
.w3-gold,.w3-hover-gold:hover{color:#fff!important;background-color:#c9a000!important}
.w3-btn {
background-color: #c9a000;
color: white;
padding: 16px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 0px;
-webkit-transition-duration: 0.4s;
transition-duration: 0.4s;
cursor: pointer;
float: right;
}
}
.button1 {
background-color: black;
color: white;
}
.button1:hover {
background-color: #e7e7e7;
color: black
}
.button2 {
background-color: #c9a000;
color: white;
}
.button2:hover {
background-color: #e7e7e7;
color: black
}
</style>
</head>
<body>
<div class="w3-container">
<div class="w3-card-4">
<div class="container w3-gold">
<h2>Input Form</h2>
</div>
<form class="w3-container">
<p>
<select class="w3-select" name="option" id="option">
<option value="" disabled selected>Generate or Choose?</option>
<option value="1" >Generate</option>
<option value="2" >Choose</option>
</select>
<input class="w3-input" id="inputt" type="text">
<label class="w3-text">Type in a number<label>
</p>
<p>
<div class="w3-btn button2" id="BT2">Clear</div>
<div class="w3-btn button1" id="BT1">Proceed</div>
<div id ="done"></div>
<div id="out"></div>
<div id="gout"></div>
</form>
<script>
function prime(num) {
var stop = num % 2 == 0
var num1 = 2
var num2 = 2
while (stop == false && num2 <= Math.sqrt(num)) {
stop = num1 * num2 == num
num1++
if (num1 == num) {
num1 = 2
num2++
}
}
if (stop == true) {
return(num + " is not prime.")
} else {
return(num + " is prime")
}
}
document.getElementById("BT1").addEventListener("click", function(){
if (isNaN(document.getElementById("inputt").value) == false && document.getElementById("inputt").value != "" && document.getElementById("option").value == 1) {
document.getElementById("out").innerHTML = "<br> Generating up to " + document.getElementById("inputt").value + "!"
document.getElementById("gout").innerHTML = ""
for (num3 = 1; num3 <= parseInt(document.getElementById("inputt").value); num3++) {
document.getElementById("gout").innerHTML = document.getElementById("gout").innerHTML + "<br>" + prime(num3)
}
document.getElementById("done").innerHTML = "done!"
} else if (isNaN(document.getElementById("inputt").value) == false && document.getElementById("inputt").value != "" && document.getElementById("option").value == 2) {
document.getElementById("out").innerHTML = "Checking if " + document.getElementById("inputt").value + " is prime!"
document.getElementById("gout").innerHTML = "<br>" + prime(parseInt(document.getElementById("inputt").value))
} else if (document.getElementById("inputt").value != "") {
document.getElementById("out").innerHTML = document.getElementById("inputt").value + " is not a number!"
} else {
document.getElementById("out").innerHTML = "Thats a blank space!"
}
});
document.getElementById("BT2").addEventListener("click", function(){
document.getElementById("gout").innerHTML = ""
document.getElementById("out").innerHTML = ""
document.getElementById("done").innerHTML = ""
});
</script>
</div>
</div>
</body>
</html>
要立即修复，您可以使用以下内容替换for循环的内容：
var pr = prime(num3);
var cont = document.createTextNode(pr);
var br = document.createElement('br');
document.getElementById("gout").appendChild(br);
document.getElementById("gout").appendChild(cont);
滞后的原因是设置innerHTML是一个非常时间的操作，我想。