<script type="text/javascript"> var str="sdf(sd234f(sd23f(2345sd"; var number=0; for (var i=0;i<str.length;i++){ if (str.charAt(i)=="("){ number=number+1; } } alert(number); </script>
var str = "sdf(sd234f(sd23f(2345sd"; var number = str.split("(").length-1;
能不能用str.indexOf('(')来判断? 当indexOf返回>-1时,截取余下的,再次进行判断function test(){ var str = "sdf ( sd234f ( sd23f (2345sd"; var i = 0; while(str.indexOf("(")>-1){ i++; str = str.substring(str.indexOf("(")+1); } return i; }
给你个简单的例子:<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>判断正则匹配次数</title> <script language="javascript"> <!-- /* // Regex Example in JavaScript // Rainsome Studio // [email protected] // 2009-01-16 in Shanghai */ function ExecRegex() { var str="sdf ( sd234f ( sd23f (2345sd"; var regex1=/\(/gi; var arrMatches = str.match(regex1); alert("匹配次数为:" + arrMatches.length); } //--> </script> </head> <body > <form> <div>Text:sdf ( sd234f ( sd23f (2345sd</div> <div>Regex:/\(/gi</div> <input type="button" Value="Check" onClick="javascript:ExecRegex();"/> </form> </body> </html>
var str="sdf(sd234f(sd23f(2345sd";
var number=0;
for (var i=0;i<str.length;i++){
if (str.charAt(i)=="("){
number=number+1;
}
}
alert(number);
</script>
var number = str.split("(").length-1;
当indexOf返回>-1时,截取余下的,再次进行判断function test(){
var str = "sdf ( sd234f ( sd23f (2345sd";
var i = 0;
while(str.indexOf("(")>-1){
i++;
str = str.substring(str.indexOf("(")+1);
}
return i;
}
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>判断正则匹配次数</title>
<script language="javascript">
<!--
/*
// Regex Example in JavaScript
// Rainsome Studio
// [email protected]
// 2009-01-16 in Shanghai
*/
function ExecRegex()
{
var str="sdf ( sd234f ( sd23f (2345sd";
var regex1=/\(/gi;
var arrMatches = str.match(regex1);
alert("匹配次数为:" + arrMatches.length);
}
//-->
</script>
</head>
<body >
<form>
<div>Text:sdf ( sd234f ( sd23f (2345sd</div>
<div>Regex:/\(/gi</div>
<input type="button" Value="Check" onClick="javascript:ExecRegex();"/>
</form>
</body>
</html>