html代码：<!doctype html><html><head><meta charset="utf-8"><title>动画</title><script src="js/positionMessage.js"></script><script src="js/addLoadEvent.js"></script></head><body><p id="message">move</p></body></html>janascript代码：1. positionMessage.jsfunction messagefunc() { if(!document.getElementById)return false; if(!document.getElementById("message"))return false; var elem=document.getElementById("message"); elem.style.left="500px" ; var xpos=parseInt(elem.style.left); var ypos=parseInt(elem.style.top); if(xpos==200&&ypos==100){return true}; if(xpos<200){xpos++}; if(xpos>200){xpos--}; if(ypos>100){ypos--}; if(ypos<100){ypos++}; elem.style.left= xpos+"px"; elem.style.top= ypos+"px"; movement=setTimeout("messagefunc()",30); }function positionMessage(){ if(!document.getElementById) return false; if(!document.getElementById("message")) return false; var elem=document.getElementById("message"); elem.style.position="absolute"; elem.style.left="100px"; elem.style.top="50px"; elem.style.color="red"; elem.style.fontSize="1.5em"; movement=setTimeout("messagefunc()",2000); }2.addLoadEvent.jsfunction addLoadEvent(func){var oldonload=window.onload; if(typeof window.onload!='function') {window.onload=func;}else{window.onload=function(){oldonload(); func();} } }addLoadEvent(positionMessage);
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