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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>computer of juju</title>
    
</head>
<body>
    <style type="text/css">
        *{
            border: none;
            font-family: 'Open Sans',sans-serif;
            margin: 0;
            padding: 0;
        }
        h1{
            color: #495678;
            font-size: 30px;
            margin-top: 20px;
            padding-top: 50px;
            display: block;
            text-align: center;
            text-decoration: none;
        }
        form{
            background-color: #495678;
            box-shadow: 4px 4px #3d4a65;
            margin: 40px auto;
            padding: 40px 0 30px 40px;
            width:280px;
        }
        .btn{
            outline: none;
            cursor: pointer;
            font-size: 20px;
            height: 45px;
            margin: 5px 0 5px 10px;
            width: 45px;
        }
        .btn :first-child{
            margin: 5px 0 5px 10px;
        }
        .btn,#display,form{
            border-radius: 25px;
        }
        #display{
            height: 47px;
            outline: none;
            background-color: #98d1dc;
            box-shadow: inset 6px 6px 0px #3facc0;
            color: #dededc;
            font-size: 20px;
            text-align: right;
            width: 115px;
            padding-right: 10px;
            margin-left: 5px;

        }
        .num{
            background-color:#72778b;
            box-shadow: 0 5px #5f6680;
            color: #dededc;
        }
        .num:active{
            box-shadow: 0 2px #5f6680;
        }
        .op{
            background-color: #dededc;
            box-shadow: 0 5px #5f6680;
            color: #72778b;
        }
        .op:active{
            box-shadow: 0 2px #5f6680;
        }
        .other{
            background-color: #e3844c;
            box-shadow: 0 5px #e76a3d;
            color: #dededc;
        }
        .other:active{
            box-shadow: 0 2px #e76a3d;
        }
    </style>
    <h1>计算器</h1>
    <form>
        <input type="button" id="clear" class="btn other" value="C">
        <input type="button" id="delete" class="btn other" value="D">
        <input tupe="text" id="display">
        <br>
        <input type="button" class="btn num" value="7" onclick="get(this.value);">
        <input type="button" class="btn num" value="8" onclick="get(this.value);">
        <input type="button" class="btn num" value="9" onclick="get(this.value);">
        <input type="button" class="btn op" value="+" onclick="get(this.value);">
        <br>
        <input type="button" class="btn num" value="4" onclick="get(this.value);">
        <input type="button" class="btn num" value="5" onclick="get(this.value);">
        <input type="button" class="btn num" value="6" onclick="get(this.value);">
        <input type="button" class="btn op" value="*" onclick="get(this.value);">
        <br>
        <input type="button" class="btn num" value="1" onclick="get(this.value);">
        <input type="button" class="btn num" value="2" onclick="get(this.value);">
        <input type="button" class="btn num" value="3" onclick="get(this.value);">
        <input type="button" class="btn op" value="-" onclick="get(this.value);">
        <br>
        <input type="button" class="btn num" value="0" onclick="get(this.value);">
        <input type="button" class="btn op" value="." onclick="get(this.value);">
        <input type="button" class="btn op" value="/" onclick="get(this.value);">
        <input type="button" class="btn other" id="cal" value="=">
    </form>
    <p align="center" id="time"></p>
</body>
<script>
    function get(num){
        var shownums=document.getElementById("display");
        shownums.value+=num;
    }
    var cc=document.getElementById("clear");
    function clear(){
        document.getElementById("display").value="";
    }
    var dd=document.getElementById("delete");
    cc.addEventListener("click",clear,false);
    function backspace(){
        var shownums= document.getElementById("display");
        shownums.value=shownums.value.substring(0,shownums.value.length-1)
    }
    dd.addEventListener("click",backspace,false);
    var re=document.getElementById("cal");
    function cal(){
        var result=0;
        result=document.getElementById("display").value;
        document.getElementById("display").value=eval(result);
    }
    re.addEventListener("click",cal,false)

    function showTime(){
        var today=new Date();
        var y=today.getFullYear();
        var M=today.getMonth()+1;
        var d=today.getDate();
        var h=today.getHours();
        var m=today.getMinutes();
        var s=today.getSeconds();
        m=checkTime(m);
        s=checkTime(s);
        var week=today.getDay();
        var w=new Array("星期天","星期一","星期二","星期三","星期四","星期五","星期六");
        document.getElementById("time").innerHTML=y+"年"+M+"月"+d+"日"+"</br>"+h+":"+m+":"+s+"  "+w[week];
        // 每隔1秒后再次调用showTime函数
        setTimeout("showTime()",1000);

    }
    function checkTime(i){
        if(i<10){
            i="0"+i;
        }
        return i;
    }
    window.onload=function() {
        showTime();
    }
</script>
</html>