JS-使用indexof來統計字元出現次數
阿新 • • 發佈：2018-11-11
<!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學習</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>
functionfun(){ 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; }
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博主：十二月出行
原文：https://www.cnblogs.com/wcphahaha/p/9855088.html#4099421