<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML><HEAD><TITLE> New Document </TITLE><META NAME="Generator" CONTENT="EditPlus"><META NAME="Author" CONTENT=""><META NAME="Keywords" CONTENT=""><META NAME="Description" CONTENT=""></HEAD><BODY><script language="javascript"> <!-- var visible=true; function Change() { var bt2=document.getElementById("t2"); if(visible) { bt2.style.visibility="hidden"; visible=false; } else { bt2.style.visibility="visible"; visible=true; } } //================ var visible3=true; function Change1() { var bt3=document.getElementById("t3"); if(visible3) { bt3.style.display="none"; visible3=false; } else { bt3.style.display="block"; visible3=true; } } // --></script></BODY><div id="t2" style="width:100px;height=100px;border:2px green solid;background-color:red;"></div> <br /><input type="button" value="变化" onclick="Change()"/> <div id="t3" style="width:100px;height=100px;border:2px green solid;background-color:red;"></div><br /><input type="button" value="变化2" onclick="Change1()"/></HTML>================================两个东西:display 和 visibility