一,效果图。
二,代码。
<!DOCTYPE html>
<html> <head>
<meta charset="utf-8">
<title>javascript while循环</title>
</head> <body>
<!--while循环-->
<p>点击下面的按钮,只要 i 小于 5 就一直循环代码块。</p>
<button onclick="myFunction()">点击这里</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = "",
i = 0;
while (i < 5) {
x = x + "The number is " + i + "<br>";
i++;
}
document.getElementById("demo").innerHTML = x;
}
</script>
<!--do-while循环-->
<p>点击下面的按钮,只要i小于5就一直循环代码块</p>
<button onclick="myFunction()">点击这里</button>
<p id="demo1"></p>
<script>
function myFunction() {
var x = "",
i = 0;
do {
x = x + "the number is" + i + "<br>";
i++;
}
while (i < 5)
document.getElementById("demo1").innerHTML = x;
}
</script>
</body> </html>
参考资料:《菜鸟教程》