写一个火箭发射的HTML程序
<html>
<head>
<title>Rocket Launch</title>
</head>
<body>
<h1>Rocket Launch</h1>
<!-- Create a button to launch the rocket -->
<button onclick="launch()">Launch Rocket</button>
<!-- Create an image to represent the rocket -->
<img id="rocket" src="rocket.png" width="100px" height="100px">
<!-- Add some JavaScript to make the rocket move -->
<script type="text/javascript">
function launch() { // Function to move the rocket when button is clicked.
// Get the current position of the rocket.
var pos = 0;
// Set an interval to move the rocket 10 pixels at a time.
var id = setInterval(frame, 10);
function frame() { // Function that moves the rocket 10 pixels each time it's called.
if (pos == 350) { // Stop moving when we reach 350 pixels from left of window.
clearInterval(id); // Clear our interval when done moving.
} else { // Otherwise, keep moving by incrementing position by 10 pixels each time it's called.
pos++;
document.getElementById("rocket").style.left = pos + 'px'; // Update left property of element with ID "rocket". } } </script> </body></html
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