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(
Big: + txt.big() +
) document.write(Small: + txt.small() +
) document.write(Bold: + txt.bold() +
) document.write(Italic: + txt.italics() +
) document.write(Blink: + txt.blink() + (does not work in IE)
) document.write(Fixed: + txt.fixed() +
) document.write(Strike: + txt.strike() +
) document.write(Fontcolor: + txt.fontcolor(Red) +
) document.write(Fontsize: + txt.fontsize(16) +
) document.write(Link: + txt.link(https://www.w3school.com.cn) +
)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)+ ); document.write(hw_text.indexOf(world)+ ); document.write(hw_text.indexOf(abc)+ );4.内容替换：
var str=Visit Microsoft! document.write(str.replace(/Microsoft/,W3School))效果图：
示例代码：
body {background-color:#e6e6e6} （一）length属性：获取字符串的长度
Hello world, Hello javascript!
<script> var s = document.getElementById(hw).innerHTML; document.write(length:+s.length); </script> （二）为字符串添加样式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
some words
Call txt.big()<script> var txt = document.getElementById(hw_02).innerHTML; document.write(Big: + txt.big() +
) document.write(Small: + txt.small() +
) document.write(Bold: + txt.bold() +
) document.write(Italic: + txt.italics() +
) document.write(Blink: + txt.blink() + (does not work in IE)
) document.write(Fixed: + txt.fixed() +
) document.write(Strike: + txt.strike() +
) document.write(Fontcolor: + txt.fontcolor(Red) +
) document.write(Fontsize: + txt.fontsize(16) +
) document.write(Link: + txt.link(https://www.w3school.com.cn) +
) function alertBig(){ alert(txt.big()); } </script> （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 <script> var hw_text = Hello world; document.write(hw_text.indexOf(Hello)+
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