■スクリプト
<HTML>
<HEAD>
<TITLE>Sample</TITLE>
</HEAD>
<BODY bgColor="white">
<CENTER>
<H1>指定位置の文字を抜き出します</H1>
</CENTER>
<TABLE BORDER="1">
<SCRIPT Language="JavaScript">
<!--
str = "Welcome to JavaScript Hell...";
document.write("<TR><TD colspan='2'>",str,"</TD></TR>");
for (i=0; i<str.length; i++) document.write("<TR><TD>0〜",i,"</TD><TD>",str.substring(0,i),"</TD></TR>");
// -->
</SCRIPT>
</TABLE>
</BODY></HTML>