安科网
源代码：
点击运行
<!DOCTYPE html> <html> <body> <p id="demo">Click the button to locate where in the string a specifed value occurs.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var str="Hello world, welcome to the universe."; var n=str.indexOf("welcome"); document.getElementById("demo").innerHTML=n; } </script> </body> </html>
运行结果
Copyright © 2013 - 2019 Ancii.com All Rights Reserved
京ICP备18063983号-5
京公网安备11010802014868号