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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(){
        //这个函数被oOpenBaiduBtn调用，此时的this就是这个button
        oBaiduWin = window.open("https://www.baidu.com","_blank");
    },false);

    var oCloseBaiduBtn = this.document.getElementById("closeBaiduBtn");
    oCloseBaiduBtn.addEventListener("click",function(){
        oBaiduWin.close();
    },false);

    var oBlankWin;
    var oPenNewBtn = this.document.getElementById("openNewBtn");
    oPenNewBtn.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 = "https://www.baidu.com";
        oBlankWin.document.URL = "https://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("https://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 changeColorInteval(){
    var colors = ["hotpink", "blue", "green", "yellow", "red","lightskyblue"];
    if(count > 0){
        --count;
        var color = colors[count];
        oIntervalBox.style.backgroundColor = color;
        oIntervalText.innerHTML = count;
    }
}

//重复性定时器setInterval
oStartIntervalBtn.addEventListener("click",function(){
    window.clearInterval(interval);
    count = 6;
    oIntervalText.innerHTML = count;
    interval = window.setInterval(changeColorInteval,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.document.referrer);


console.log(window.navigator.userAgent);

if(window.navigator.userAgent.indexOf("Chrome")>-1){
    console.log("I'm a 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>
    <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>
    <div>
        <button id="alertBtn">打开警告窗口</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;
}