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("") + "</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"""><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("") + "</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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