var a = "abcDEfGgdefg32asdf38";
document.write("原始:"+a+"
")
document.write("粗体:"+a.bold()+"
");
document.write("大号:"+a.big()+"
");
document.write("斜体:"+a.italics()+"
");
document.write("删除线:"+a.strike()+"
");
document.write("字体大小:"+a.fontsize(10)+"
");
document.write("字体颜色:"+a.fontcolor("#ff0000")+"
");
document.write("上标:"+a.sup()+"
");
document.write("下标:"+a.sub()+"
");
document.write("大写:"+a.toUpperCase()+"
");
document.write("大写:"+a.toLowerCase()+"
");
document.write("返回索引字符:"+a.charAt(3)+"
");//这里应该是"D"
document.write("返回索引:"+a.indexOf("f")+"
");//这里应该是5
document.write("返回索引(逆向查找):"+a.lastIndexOf("f")+"
");//这里应该是9
document.write("查找字符串:"+a.search("f")+"
");//这里应该是5，与indexOf相同
document.write("替换字符串:"+a.replace("a","A")+"
");//把字符串中的a替换成A
document.write("返回子串:"+a.slice(1,3)+"
");//应该是bc,返回从索引1到3－1的子串
document.write("分割字符串:"+a.split("D").toString()+"
");//把D作为分割符，分割字符串，返回数组
document.write("返回子串:"+a.substr(1,2)+"
");//返回子串，从索引1开始，长度为2,这里就是bc
document.write("返回子串:"+a.substring(1,3)+"
");//与sclice()相同，返回索引1到3－1的子串
document.write("匹配:"+a.match(/d+/)+"
");//正则匹配，返回匹配的结果，这里是32
