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In JavaScript, the alert() method is used to display an alert box with a specified message and an OK button. The syntax is "alert(message)"; where message is used to represent the message to be popped up on the window. The plain text displayed in the dialog box.
The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.
Definition and usage
The alert() method is used to display an alert box with a specified message and an OK button.
Syntax
alert(message)
Parameter Description
message The plain text (not HTML text) to be displayed in the pop-up dialog box on the window
The example is as follows :
<html>
<head>
<script type="text/javascript">
function disp_alert()
{
alert("我是一个消息框！")
}
</script>
</head>
<body>
<input type="button" onclick="disp_alert()" value="显示消息框" />
</body>
</html>Output result:
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