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window.addEventListener("load",function()
{
var oOpenBaidiBtn=this.document.getElementById("openBaiduBtn");
var oBaiduWin=null;
oOpenBaidiBtn.addEventListener("click",function()
{
oBaiduWin=window.open("http://www.baidu.com","_black");
});
var oCloseBaiduBtn=this.document.getElementById("closeBaiduBtn");
oCloseBaiduBtn.addEventListener("click",function()
{
oBaiduWin.close();
});

var oOpenNewBtn=this.document.getElementById("openNewBtn");
var oNewWin=null;
oOpenNewBtn.addEventListener("click",function()
{
oNewWin=window.open();
});
var oChangeNewBtn=this.document.getElementById("changeNewBtn");
oChangeNewBtn.addEventListener("click",function()
{
oNewWin.document.title="新窗口";
oNewWin.document.body.innerHTML="<div><p><strong>Hi</strong>,I`m a new window</p ></div>";
oNewWin.document.body.style.color='blue';
});
var oCloseNewBtn=this.document.getElementById("closeNewBtn");
oCloseNewBtn.addEventListener("click",function()
{
oNewWin.close();
});

var oAlertBtn=this.document.getElementById("alertBtn");
oAlertBtn.addEventListener("click",function()
{
window.alert('我是警告窗口');
});
var oConfirmBtn=this.document.getElementById("confirmBtn");
oConfirmBtn.addEventListener("click",function()
{
var bConfirmed=window.confirm("是否确认打开百度");
if(bConfirmed)
{
window.open("http://www.baidu.com","_black")
}
});

var oPromptBtn=this.document.getElementById("promptBtn");
oPromptBtn.addEventListener("click",function()
{
var strText=window.prompt("请输入提示：");
if(strText)
{
var oText=window.document.getElementById('text');
//oText.innerHTML=strText;
oText.innerText=strText;
}
});

var oStartTimer=this.document.getElementById('startTimer');
var oStopTimer=this.document.getElementById('stopTimer');
var oTimerBox=this.document.getElementById('timerBox');
var oTimer;

oStartTimer.addEventListener("click",function()
{
if(oTimer)
{
windwo.clearTimeout(oTimer);
}
oTimer = window.setTimeout(function()
{
oTimerBox.style.backgroundColor = "blue";
},2000);
});

oStopTimer.addEventListener("click",function()
{
if(oTimer)
{
window.clearTimeout(oTimer);
}
})

<!DOCTYPE html> 
<html>
<head>
<meta charset="utf-8" />
<title></title>
<script>
</script>
</head>
<body>
<div>
<button id="openBaiduBtn">打开百度</button>
<button id="closeBaiduBtn">关闭百度</button>
</div>
<br/>
<div>
<button id="openNewBtn">打开空白页面</button>
<button id="changeNewBtn">绘制空白页面</button>
<button id="closeNewBtn">关闭空白页面</button>
</div>
<br/>
<div>
<button id="alertBtn">打开告警窗口</button>
<button id="confirmBtn">打开确认窗口</button>
<br/>
<div>
<button id="promptBtn">打开提示窗口</button>
<label>提示文字:</label><p id="text"></p >
</div>
</div>
<br/>
<div>
<button id = "startTimer">开始</button>
<button id = "stopTimer">结束</button>
<div id="timerBox"></div>
</div>
<br/>
<div>
<button id = "startInterval">开始</button>
<button id = "stopInterval">结束</button>
<div id="intervalBox"></div>
<span>倒计时：</span><span id="intervalText"></span>
</div> 
</body>
</html>

#timerBox {
width: 100px;
height: 100px;
border : 1px solid black;
background-color: lightblue;
}

#intervalBox {
width: 100px;
height: 100px;
border : 1px solid black;
background-color:royalblue;
}