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隨機數Math對象下的random方法，源碼如下，可以直接使用。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head> <title></title> <style type="text/css"> .de{ width:450px; height:450px; border:4px solid #ccc; margin:0 auto; margin-top:50px;} .we{ width:450px; height:450px;} </style> <script type="text/javascript"> function de() { var we = document.getElementById("we"); var img = ["XMJ.jpg", "XMJX.jpg", "psb.jpg"]; //url 連結數組 var allNumber = img.length; // 儲存img的個數 var randomImg = parseInt(allNumber * Math.random()); //Math.random隨機數 we.setAttribute("src",img[randomImg]); } window.onload = function () { de(); } </script></head><body> <div class="de"> <img src="psb.jpg" alt="" title="" class="we" id="we" /> </div></body></html>Start building with 50+ products and up to 12 months usage for Elastic Compute Service
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