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Javascript：字符串对象（string）的基本操作

2015-02-03 09:33 357 查看

本文代码整理自w3school：http://www.w3school.com.cn

1.获取字符串的长度：

var s = "Hello world";
document.write("length:"+s.length);

2.为字符串添加各种样式，如：

var txt = "Some words";
document.write("<p>Big: " + txt.big() + "</p>")
document.write("<p>Small: " + txt.small() + "</p>")
document.write("<p>Bold: " + txt.bold() + "</p>")
document.write("<p>Italic: " + txt.italics() + "</p>")
document.write("<p>Blink: " + txt.blink() + " (does not work in IE)</p>")
document.write("<p>Fixed: " + txt.fixed() + "</p>")
document.write("<p>Strike: " + txt.strike() + "</p>")
document.write("<p>Fontcolor: " + txt.fontcolor("Red") + "</p>")
document.write("<p>Fontsize: " + txt.fontsize(16) + "</p>")
document.write("<p>Link: " + txt.link("http://www.w3school.com.cn") + "</p>")

3.获取字符串中部分内容首次出现的位置：

var hw_text = "Hello world";
document.write(hw_text.indexOf("Hello")+"<br/>");
document.write(hw_text.indexOf("world")+"<br/>");
document.write(hw_text.indexOf("abc")+"<br/>");

4.内容替换：

var str="Visit Microsoft!"
document.write(str.replace(/Microsoft/,"W3School"))

效果图：

示例代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Content-Language" content="zh-cn" />

<title>Javascript 字符串对象</title>
<head>
<style>
body {background-color:#e6e6e6}
</style>
</head>

<body>
<h3>（一）length属性：获取字符串的长度</h3>
<p id="hw">Hello world, Hello javascript!</p>
<script>
var s = document.getElementById("hw").innerHTML;
document.write("length:"+s.length);
</script>

<h3>（二）为字符串添加样式</h3>
<p>对字符串调用样式的相关方法时，会自动拼接相应的html标签</p>
<p id = "hw_02">some words</p>
<button onclick="alertBig()">Call txt.big()</button>
<script>
var txt = document.getElementById("hw_02").innerHTML;
document.write("<p>Big: " + txt.big() + "</p>")
document.write("<p>Small: " + txt.small() + "</p>")

document.write("<p>Bold: " + txt.bold() + "</p>")
document.write("<p>Italic: " + txt.italics() + "</p>")

document.write("<p>Blink: " + txt.blink() + " (does not work in IE)</p>")
document.write("<p>Fixed: " + txt.fixed() + "</p>")
document.write("<p>Strike: " + txt.strike() + "</p>")

document.write("<p>Fontcolor: " + txt.fontcolor("Red") + "</p>")
document.write("<p>Fontsize: " + txt.fontsize(16) + "</p>")

document.write("<p>Link: " + txt.link("http://www.w3school.com.cn") + "</p>")

function alertBig(){
alert(txt.big());
}
</script>

<h3>（三）indexOf方法:定位字符串中某一个指定的字符首次出现的位置</h3>
<script>
var hw_text = "Hello world";
document.write(hw_text.indexOf("Hello")+"<br/>");
document.write(hw_text.indexOf("world")+"<br/>");
document.write(hw_text.indexOf("abc")+"<br/>");
</script>

<h3>（四）replace()方法：替换字符串中的部分内容</h3>
<script>
var str="Visit Microsoft!"
document.write(str.replace(/Microsoft/,"W3School"))
</script>

</body>

</html>

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标签： javascript 字符串

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