In JavaScript, the value attribute can set or return the default value of the text field, and the syntax is "attribute.value=value" or "attribute.value".
The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.
What is the usage of value in JavaScript
The value attribute can set the default value of the text field.
Syntax:
Set attribute value
attribute.value=value
Return attribute value
attribute.value
Return value: String, representing the value of the attribute.
The example is as follows:
<html>
<head>
<script type="text/javascript">
function alertValue()
{
alert(document.getElementById("password1").value)
}
</script>
</head>
<body>
<form>
<input type="password" id="password1" value="thgrt456" />
<input type="button" id="button1" onclick="alertValue()" value="Show default value" />
</form>
</body>
</html>Output result:
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