<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>try_throw_catch_finally</title>
</head>
<body>
<P> Regardless of whether the correct input, the input box will be emptied after entering. </ P>
<P> Please enter a number between 5 ~ 10: </ p>
<input id="demo" type="text">
<button type="button" onclick="myFunction()">点我</button>
<p id="p01"></p>
<script>
function myFunction() {
let message, x;
message = document.getElementById("p01");
message.innerHTML = "";
x = document.getElementById("demo").value;
try {
Value if (x == "") throw "empty";
if (isNaN (x)) throw "value is not a number";
x = Number(x);
if (x > 10) throw "太大";
if (x < 5) throw "太小";
if (x> = 5 && x <= 10) message.innerHTML = "test pass."
} catch (err) {
message.innerHTML = "错误: " + err + ".";
} finally {
document.getElementById("demo").value = "";
}
}
// Reference: https: //www.runoob.com/js/js-errors.html
</script>
</body>
</html>
js try_throw_catch_finally.html
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Origin blog.csdn.net/weixin_42193179/article/details/90905084
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