indexOf()如何查找第N個(gè)
indexOf()如何查找第N個(gè)
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2017-03-13
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2017-08-22
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>string對(duì)象 </title>
<script type="text/javascript">
?var str = "Hello World!ol ol ol ol ol ol ol";
var con= 0;
for(i=1;i<str.length;i++)?
{
? con= str.indexOf("o",con);
? if (con!=-1)
? {con+=1;}
? else?
? {break;}; ?
? if(i==3)
? {document.write("第"+i+"個(gè)o的位置是"+con+"<br>");
? break;}
? else{}
}
</script>
</head>
<body>
</body>
</html>
2017-03-13
obj.indexOf('N');