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window.addEventListener("load",function(){
    var oBaiduWin;
    //此时的this就是当前窗口
    var oOpenBaiduBtn=this.document.getElementById("openBaiduBtn");
    oOpenBaiduBtn.addEventListener("click",function(){
        oBaiduWin=window.open("http://www.baidu.com","_blank");
    },false);
    var oCloseBaiduBtn=this.document.getElementById("closeBaiduBtn");
    oCloseBaiduBtn.addEventListener("click",function(){
        oBaiduWin.close();
    },false);
//打开新页面
    var oBlankWin;
    var oOpenNewBtn=this.document.getElementById("openNewBtn");
    oOpenNewBtn.addEventListener("click",function(){
        oBlankWin=window.open();
        console.log(oBlankWin.location.herf);
    });
//绘制空白页面
    var oChangeNewBtn=this.document.getElementById("changeNewBtn");
    oChangeNewBtn.addEventListener("click",function(){
        oBlankWin.document.title="新窗口";
        oBlankWin.document.write("Hi,I'm a new window.");
        oBlankWin.document.body.innerHTML="<div><strong>Hi</strong>,I'm a new window</div>";
        oBlankWin.document.body.style.color="blue";
        console.log(oBlankWin.location.href);
        //oBlankWin.location.href = "http://www.baidu.com";
        //oBlankWin.document.URL=href = "http://www.baidu.com";
        console.log(oBlankWin.location.href); 
    });

    var oCloseBaiduBtn=this.document.getElementById("closeNewBtn");
    oCloseBaiduBtn.addEventListener("click",function(){
        oBlankWin.close();
},false);
//打开警告窗口（给你一个信息）
    var oAlertBtn=this.document.getElementById("alertBtn");
    oAlertBtn.addEventListener("click",function(){
        window.alert("我是警告窗口");
},false);
//打开确认窗口（做某件事情用）
    var oConfirmBtn=this.document.getElementById("confirmBtn");
    oConfirmBtn.addEventListener("click",function(){
        var bOpen=window.confirm("你想打开百度么");
        if(bOpen){
            window.open("http://www.baidu.com");
        }
},false);
//打开提示窗口（输一些信息进去，返回一些文字，做一些记录）
    var oPromtBtn=this.document.getElementById("promptBtn");
    oPromtBtn.addEventListener("click",function(){
        var oText=window.document.getElementById("text");
        var text=window.prompt("请输入提示文字:");
        oText.innerHTML=text;
},false);

//倒计时
var oStartTimerBtn=this.document.getElementById("startTimer");
var oStopTimerBtn=this.document.getElementById("stopTimer");
var oTimerBox=this.document.getElementById("timerBox");
var timer;

function changeColor(){
    oTimerBox.style.backgroundColor="red";
}
oStartTimerBtn.addEventListener("click",function(){
    timer=window.setTimeout(changeColor,2000)
});

oStopTimerBtn.addEventListener("click",function(){
    window.clearTimeout(timer);
});

//轮播效果
var oStartIntervalBtn=this.document.getElementById("startInterval");
var oStopIntervalBtn=this.document.getElementById("stopInterval");
var oIntervalBox=this.document.getElementById("intervalBox");
var oIntervalText=this.document.getElementById("intervalText");

var interval;
var count=6;
oIntervalText.innerHTML=count;

function changeColorInterval(){
    var colors=["hotpink","blue","green","yellow","red","lightskyblue"];
    if(count>0){
        --count;
        var color=colors[count];
        oIntervalBox.style.backgroundColor=color;
        oIntervalText.innerHTML=count;
    }
}
oStartIntervalBtn.addEventListener("click",function(){
    window=clearInterval(interval);
    count=6;
    oIntervalText.innerHTML=count;
    interval=window.setInterval(changeColorInterval,2000)
});

oStopIntervalBtn.addEventListener("click",function(){
    window.clearInterval(interval);
});

console.log(window.location.herf);
console.log(window.location.search);
console.log(window.location.hash);

console.log(window.navigator.userAgent);

if(window.navigator.userAgent.indexOf("Chrome")>-1){
    console.log("I'm Chrome");
}

console



},false);

<!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>
        <button id="promptBtn">打开提示窗口</button>
        <div>
        <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;
}