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Examples of functions with variable number of parameters in JavaScript

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2016-05-16 16:34:341566browse

JavaScript allows a function to pass a variable number of parameters because there is a built-in object called arguments, which is an array of all parameters passed by a function.

Off-topic: I came into contact with JavaScript very early, but I didn’t pay attention to it. I saw many cool and dazzling web pages with JavaScript in them. Google’s application of JavaScript had the greatest impact on me. I was determined to learn it from scratch, hence the JavaScript & Ajax section. I plan to record this column as study notes, so the notes for each article may be very short, just one or two sentences of annotations.

JavaScript allows a function to pass a variable number of parameters because there is a built-in object called arguments, which is an array of all parameters passed by a function. Give an example and you will understand. 

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JavaScript参数个数可变的函数</title>
<mce:script language="javascript" type="text/javascript"><!--
function testparams()
{
var params = "";
for (var i=0; i<arguments.length; i++) {
params = params + " " + arguments[i];
}
alert(params);
}

testparams("abc", 123);
testparams(123, "456", 789);
testparams();
// --></mce:script>
</head>
<body>
</body>
</html>

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