使用 throw语句引发内置异常或自定义异常。以后可以捕获这些异常，您可以采取适当的措施。
您可以尝试运行以下代码来实现throw语句-
<html>
<head>
<script>
<!--
function myFunc() {
var a = 100;
var b = 0;
try{
if ( b == 0 ){
throw( "除以零误差。" );
} else {
var c = a / b;
}
}
catch ( e ) {
alert("Error: " + e );
}
}
//-->
</script>
</head>
<body>
<p>Click the following to see the result:</p>
<form>
<input type = "button" value = "Click Me" onclick = "myFunc();" />
</form>
</body>
</html>