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JavaScript Array length Issues

Source: Internet
Author: User
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Mu class network of a topic began to do not know the elements of the array, by the elements of the execution of output, only to understand

<! DOCTYPE html>
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<title> Arrays </title>
<script type= "Text/javascript" >
Create an array
var arr=[' * ', ' # # ', ' * * * ', ' && ', ' * * * ', ' ##* '];
arr[7]= "* *";
Display array length
alert (arr.length);

Outputs the contents of the array to achieve the desired effect.
document.write (arr[0]+ "<br>");
document.write (arr[1]+ "<br>");
document.write (arr[2]+ "<br>");
document.write (arr[3]+ "<br>");
document.write (arr[4]+ "<br>");
document.write (arr[5]+ "<br>");
document.write (arr[6]+ "<br>");
document.write (arr[7]+ "<br>");
</script>
<body>
</body>

The output is: *
##
***
&&
****
##*
Undefined
**

Problem: Unaware that the array will change in length as the element increases.
　　　　　　　　　　　　

JavaScript Array length Issues

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