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console 命令行工具 X clear

                    
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console
window.addEventListener("load", function(){

    var oOpenBaiduBtn = this.document.getElementById("openBaiduBtn");
    var oBaiduWin = null;
    oOpenBaiduBtn.addEventListener("click", function(){
        oBaiduWin = window.open("http://www.baidu.com", "_blank");
    });

    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();
    })


})
<!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>
</body>
</html>