JS-使用indexof来统计字符出现次数

时间：2021-12-24 18:25:20
<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <meta http-equiv="X-UA-Compatible" content="ie=edge">

    <link rel="stylesheet" href="./index.css">

    <title>js学习</title>

</head>

<body>

    <p id="p1">start,stop,speed,start,speed ,velocicty,start</p>

    <button onclick="fun()">Try it</button>

    <p id="demo"></p>

    <script src="./index.js"></script>

</body>

</html>
function fun(){

    var str = document.getElementById("p1").innerHTML;

    var num=0;

    var a=str.indexOf("start");

    while(a!==-1){

        a=str.indexOf("start",a+1);

        num++;

    }

    document.getElementById("demo").innerHTML = num;

}

转载自

博主：十二月出行

原文：https://www.cnblogs.com/wcphahaha/p/9855088.html#4099421

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