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window.addEventListener("load",function(){
    var oBaiduWin;
    //此时this是当前窗口
    var oOpenBaiduBtn=this.document.getElementById("openBaiduBtn");
    oOpenBaiduBtn.addEventListener("click",function(){
        //这个函数被openBaiduBtn调用，此时this变成了button，所以要用window
        oBaiduWin=window.open("http://www.baidu.com","_blank");
    },false);
    var oCloseBaiduBtn=this.document.getElementById("closeBaiduBtn");
    oCloseBaiduBtn.addEventListener("click",function(){
        oBaiduWin=close();
    },false);

    var oBlankWin;
    //打开空白页
    var oOpenNewBtn=this.document.getElementById("openNewBtn");
    oOpenNewBtn.addEventListener("click",function(){
        oBlankWin=window.open();
    });
    //绘制空白页
    var oChangeNewBtn=this.document.getElementById("changeNewBtn");
    oChangeNewBtn.addEventListener("click",function(){
        //oBlankWin.document.write("詹小茹好傻噢！！！");
        oBlankWin.document.title="新窗口";
        oBlankWin.document.body.innerHTML="<div><strong>Hi</strong></div>";
        //把空白页变成百度
        console.log(oBlankWin.location.href);
        //oBlankWin.location.href="http://www.baidu.com";
        //只能用于查看网址，但不能去修改它
        oBlankWin.document.URL="http://www.baidu.com";
        console.log(oBlankWin.location.href); 
    });
    //关闭空白页
    var oCloseNewBtn=this.document.getElementById("closeNewBtn");
    oCloseNewBtn.addEventListener("click",function(){
        oBlankWin.close();
    },false);

    //打开三种不同的窗口
    var oAlertBtn=this.document.getElementById("alertBtn");
    oAlertBtn.addEventListener("click",function(){
        window.alert("警告窗口");
    },false);
    var oCofirmBtn=this.document.getElementById("cofirmBtn");
    oCofirmBtn.addEventListener("click",function(){
        //window.confirm("确认窗口");
        var bOpen=window.confirm("打开百度？");
        if(bOpen){
            window.open("http://www.baidu.com");
        }
        
    },false);
    var oPromptBtn=this.document.getElementById("promptBtn");
    oPromptBtn.addEventListener("click",function(){
        //window.prompt("提示窗口");
        var oText=window.document.getElementById("text");
        var text=window.prompt("输入提示文字：");
        oText.innerHTML=text;
    },false);

    var oStartTimerBtn=this.document.getElementById("starTimer");
    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
    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;

    function changeColorInterval(){
        var colors=["hotpink","blue","green","yellow","red"];
        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.href);
    console.log(window.location.search);
    console.log(window.location.hash);

},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">打开警告窗口</button>
            <button id="cofirmBtn">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 = "starTimer">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;
}