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字符串截取问题,谁来帮我解释下?

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字符串截取问题,谁来帮我解释下?[已结贴,结贴人:]

发表于：2007-07-12 10:23:30 楼主

我提取了网页的html代码,我需要body里的内容.我用了
str1 = str1.substring（str1.indexof（start_str) + 34, str1.indexof（end_str) -str1.indexof（start_str) - 34)
这样可以提取出body之间的内容,但是我不明白这样为什么会去掉body头和body尾.
为什么要加+34和-34,哪位达人帮忙解释一下好吗?

网页代码如下:
<!doctype html public "-//w3c//dtd html 4.0 transitional//en ">
<html>
<head>
<title> test1 </title>
<meta content= "microsoft visual studio .net 7.1 " name= "generator ">
<meta content= "visual basic .net 7.1 " name= "code_language ">
<meta content= "javascript " name= "vs_defaultclientscript ">
<meta content= "http://schemas.microsoft.com/intellisense/ie5 " name= "vs_targetschema ">
</head>
<body id= "bodyid " runat= "server " ms_positioning= "gridlayout ">
<form id= "form1 " method= "post " runat= "server ">
<asp:button id= "button1 " style= "z-index: 101; left: 312px; position: absolute; top: 160px " runat= "server "
text= "button "> </asp:button>
<asp:textbox id= "textbox1 " style= "z-index: 102; left: 240px; position: absolute; top: 200px "
runat= "server " width= "184px " height= "24px "> </asp:textbox> </form>
</body>
</html>

发表于：2007-07-12 10:38:191楼得分:0

不是没分就都不来了吧.....

发表于：2007-07-12 10:50:552楼得分:0

dim start_str as string = " <body ms_positioning= " " " + "gridlayout " "> "
dim end_str as string = " </body> "
忘贴start_str和end_str了.

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