eighth week(1)

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>查询字符串次数</title>
</head>
<body>
<button onclick="myFunction()">点击查询字符串中"first"字符出现的次数</button>
<p id="demo"></p>

<script type="text/javascript">
 function myFunction()
 {
     var str = "first,second,third,first,speed,first,flexible,first,third";
     var count=0;
     var index=0;
     var key="first";
     while((index = str.indexOf(key,index))!= -1)
     {
         index += key.length;
         count = count+1;
    }
    document.getElementById("demo").innerHTML = count;
}
</script>
</body>
</html>

 

注：本文借鉴自https://www.cnblogs.com/yyh187/p/9835689.html

posted @ 2018-10-24 21:01  未染流年  阅读(141)  评论(0)    收藏  举报