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window.addEventListener("load", function() {
    var oBaiduWin;
    //此时的this就是当前的窗口
    var oOpenBaiduBtn = this.document.getElementById("openBaiduBtn");
    oOpenBaiduBtn.addEventListener("click", function(){
        //这个函数被openBaiduBtn调用，此时的this就是这个button
        oBaiduWin = window.open("http://www.baidu.com", "_blank");
        console.log("line 9:" + oBaiduWin.document.referrer);
    },false);
    var oCloseBaiduBtn = this.document.getElementById("closeBaiduBtn");
     oCloseBaiduBtn.addEventListener("click", function(){
        oBaiduWin.close();
    },false);


    var oBlankWin;
    var oOpenNewBtn = this.document.getElementById("openNewBtn");
    oOpenNewBtn.addEventListener("click", function(){
        oBlankWin = window.open();
        console.log(oBlankWin.location.href);
    });

    var oChangeNewBtn = this.document.getElementById("changeNewBtn");
    oChangeNewBtn.addEventListener("click", function(){
        oBlankWin.document.title = "新窗口";
        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";
        console.log(oBlankWin.location.href);
    });

    var oCloseNewBtn = this.document.getElementById("closeNewBtn");
     oCloseNewBtn.addEventListener("click", function(){
        oBlankWin.close();
    },false);

    var oAlertBtn = this.document.getElementById("alertBtn");
     oAlertBtn.addEventListener("click", function(){
        window.alert("我是告警窗口");
    },false);

    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);

    var oPromptBtn = this.document.getElementById("promptBtn");
     oPromptBtn.addEventListener("click", function(){
        var oText = window.document.getElementById("text");
        var text = window.prompt("请输入提示文字：");
        oText.innerHTML = text;
    },false);

    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);
    });


    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.href);
    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");
    }


},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;
}