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console 命令行工具 X clear

                    
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console
<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <script>
        var d = new Date();
        document.write("今天是星期" + d.getDay()+"<br/>");
        var myDay = d.getDate();
        var myMonth = d.getMonth() + 1;
        var myYear = d.getFullYear();
        document.write("今天是" + myYear + "年" + myMonth + "月" + myDay + "日"+"<br/>");
        var d = new Date();
        var myHours = d.getHours();
        var myMinutes = d.getMinutes();
        var mySeconds = d.getSeconds();
        var myMilliseconds=d.getMilliseconds();
        document.write("当前时间是:" + myHours + ":" + myMinutes + ":" + mySeconds+":"+myMilliseconds+"<br/>");
        var d = new Date();
        d.setFullYear(2019, 06, 01);
        d.setHours(12, 59);
        d.setSeconds(59,99);
        document.write("打印时间:<br/>" + d+"<br/>");
        var str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
        var arr = str.split("");
        var result = "";
        for(var i=0;i<4;i++)
        {
            var n = Math.floor(Math.random() * arr.length);
            result += arr[n];
        }
        document.write("验证码为:"+result+ "<br/>");
        var a = Math.max(3, 9, 12, 99, 45, 78);
        var b = Math.min(3, 9, 12, 99, 45, 78);
        document.write("最大值为:" + a + "<br/>");
        document.write("最小值为:" + b+ "<br/>");
        function getRandomColor() {
            var X = Math.floor(Math.random() * (255 + 1));
            var Y  = Math.floor(Math.random() * (255 + 1));
            var Z = Math.floor(Math.random() * (255 + 1));
            var rgb = "rgb(" + X + "," + Y + "," + Z + ")";
            return rgb;
        }
        document.write(getRandomColor());
    </script>
</head>
<body>
</body>
</html>