首頁 > 開發者 > JavaScript
還有如下說法：
String.substr(N1,N2) 這個就是我們常用的從指定的位置(N1)截取指定長度(N2)的字串;
String.substring(N1,N2) 這個就有點特別了，它是先從N1，N2裡找出一個較小的值，然後從字串的開始位置算起，截取較小值位置和較大值位置之間的字串,截取出來的字串的長度為較大值與較小值之間的差。
//其中substring就可以用substr代替，結果一樣
<html>
<head>
<title>Exercise / Lab</title>
<script type="text/javascript">
function lab16() {
var entry = prompt("Enter a string - at least 5 alpha characters in lower case ", "");
var entryLength = entry.length;
document.write("<h2> You entered " + entry + "</h2>");
if(entryLength % 2 == 0) { /* Check entry length for remainder */
document.write("<h2>Even number of characters</h2><br />");
document.write("<h2>" + entry.toUpperCase() + "</h2>");
}
else {
document.write("<h2>Odd number of characters</h2><br />");
var midPoint = Math.floor(entryLength / 2);
document.write("<h2>" + entry.substring(0, midPoint).toLowerCase() +
"<font color='#ff0000'>" + entry.substr(midPoint, 1).toUpperCase() + "</font>" +
entry.substring(midPoint + 1).toLowerCase() + "</h2>");
}
}
</script>
</head>
<body>
<h2>Lab 16</h2>
<script language='javascript' type='text/javascript'>
<!--
lab16();
-->
</script>
</body>
</html>
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
