function demo(){
var judge = confirm("是否打開窗口");
if(judge){
var value = prompt("請輸入打開的網址","http://www.xianlaiwan.cn");
if(value){
window.open(value,"_black","width=400,height=500,menubar=no,toolbr=no");
}
}
}
<script type="text/javascript">
var char=document.getElementById("txt");
function MyColor(){
char.style.color="red";
char.style.backgroundColor="#ccc";
}
