Syntax format and usage of the with of method in javascript
- 2020-03-30 03:39:34
- OfStack
With statements, you don't have to specify a reference object repeatedly when accessing an object's properties and methods. The syntax of the With statement is as follows:
With Object {
Statements
}
Object specifies a reference object when an object in a statement group defaults, and we use the familiar one here Document The object of With Examples of statements. For example, When used with Document Object dependent write( ) or writeln( ) Methods are often used in the following form:
document.writeln( " Hello! " )
If you need to display large amounts of data, you will use the same multiple times document.writeln The () statement, at this point, can be as the following program, all to Document Object is placed as a statement for the reference object With Statement block, so as to achieve the goal of reducing the number of statements. Here's one With Examples of statement usage:
<html>
<head>
<title>JavaScript Unleashed</title>
</head>
<body>
<script type="text/javascript">
<! -
with(document){
write(" How do you do !");
write("<br> The title of the document is : "" + title + "".");
write("<br> Of this document URL is : " + URL);
write("<br> Now you don't have to write every time document The prefix of the object !");
}
// -->
</script>
</body>
</html>This way, you can remove the document prefix when using the methods and properties of the document.