?? debugexample5.htm
字號:
<html>
<head>
<title>Debug Example</title>
<script type="text/javascript">
function assert(bCondition, sErrorMessage) {
if (!bCondition) {
throw new Error(sErrorMessage);
}
}
function divide(iNum1, iNum2) {
assert(arguments.length == 2, "divide() requires two arguments.");
assert(typeof iNum1 == "number" && typeof iNum2 == "number",
"divide() requires two numbers for arguments.");
return iNum1.valueOf() / iNum2.valueOf();
}
alert(divide("a"));
</script>
</head>
<body>
<p>This page uses assertions to throw a custom JavaScript error.</p>
</body>
</html>
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