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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <title>案例1</title>
- </head>
- <body>
- <img id="light" src="imgs/off.gif"> <br>
- <script>
-
-
-
- let number = 0;
- setInterval(function (){
-
- let img = document.getElementById("light");
-
- if ( number % 2 == 0 ){
- img.src = "imgs/off.gif";
- }else{
- img.src = "imgs/on.gif";
- }
-
- number++;
- },1000)
- </script>
- </body>
- </html>
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