为什么这两段代码运行不一样
function openWindow(){
var k_open;
var temp = confirm("是否要打开网站？");
if(temp){
k_open = prompt("确定打开网站","http://www.imooc.com/");
if(k_open=null){
alert("您已经取消了打开");
}
else{
window.open(k_open,'_blank','width=400,height=500,menubar=no,toolbar=no')
}
}
}
function openWindow(){
var k_open;
var temp = confirm("是否要打开网站？");
if(temp){
k_open = prompt("确定打开网站","http://www.imooc.com/");
if(k_open!=null){
window.open(k_open,'_blank','width=400,height=500,menubar=no,toolbar=no')
}
else{
alert("您已经取消了打开");
}
}
}
