html+css實作一個好看的計算器實例程式碼

最終效果如下圖-2，有bug：就是整數後點選%號結果正確，如果小數後面點擊%的話結果就錯誤！其他都正常，求指點：input的value是string類型的，在JS中改如何正確處理下圖-1中的if部分？ ？

圖-1

#圖-2

#HTML程式碼如下

6c04bd5ca3fcae76e30b72ad730ca86d99afb4a0ec78806987e189e4c98398ea
    6eed0752efaf084fb70976dddbedd34a
        0c689d943f73a1c092c31716bd34abcf简单的计算器54bdf357c58b8a65c66d7c19c8e4d114
        09283fc524a4a36c146c764949aa242f@walker54bdf357c58b8a65c66d7c19c8e4d114
    94b3e26ee717c64999d7867364b1b4a3
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            bfa0a8d425fe9a3229798d95cee15aaa
        94b3e26ee717c64999d7867364b1b4a3
    94b3e26ee717c64999d7867364b1b4a3
    fa1564eb50cd496f5a54da14b70f3731
        8bd12a904b5d9201505108402ae9ca00
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        fbdd6c8cd401baffbf0f9e7071905aca
        9500030dfc6788d9b162467c0947683c
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        d296c2f21cf91f82002bc7c047cfa414
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        38714593b7af3dbf30824b049c29c6b0
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        62126d533680ecb235bebf919bc5bdd3
        16ab8776b06225c12d9d7f5e600537f8
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        a8c2d5a4860de0a891af473e29f0ccb1
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        60c0655510ce26792b889a4a5cfc2cb0
        bf234edee30f46b59214666e18c32ac0
    94b3e26ee717c64999d7867364b1b4a3
    7bcffe5f516221485a783f8c6abf3ffe
        c0ffcba5f60278bc3e0b127e4bd66c09欢迎使用JavaScript计算器54bdf357c58b8a65c66d7c19c8e4d114
            095b885e2899edf327d7d75922364d26
                27c2b160b1f3514b8ab408eba144b76c反馈5db79b134e9f6b82c0b36e0489ee08ed
            54bdf357c58b8a65c66d7c19c8e4d114
    94b3e26ee717c64999d7867364b1b4a394b3e26ee717c64999d7867364b1b4a336cc49f0c466276486e50c850b7e4956

CSS程式碼如下：

c9ccee2e6ea535a969eb3f532ad9fe89        /*Basic reset*/*{
    margin:0;
    padding:0;
    box-sizing: border-box;
    font:  14px Arial,sans-serif;
}html{
    height:100%;
    background-color:lightslategrey;
}#calculator{
    margin: 15px auto;
    width:330px;
    height:400px;
    border: 1px solid lightgray;
    background-color:darkgrey;
    padding:15px;
}/*LOGO*/.LOGO{
    height:20px;

}.LOGO .name{
    float:left;
    line-height:30px;
}.LOGO .verson{
    float:right;
    line-height:30px;
}/*screen*/#shuRu{
    margin-top:15px;
}.screen{
    margin-top:5px;
    width:300px;
    height:40px;
    text-align: right;
    padding-right:10px;
    font-size:20px;
}#keys{
    border:1px solid lightgray;
    height:223px;
    margin-top:25px;
    padding:8px;
}#keys .last{
    margin-right:0px;
}.footer{
    margin-top:20px;
    height:20px;
}.footer .link{
    float:right;
}#keys .buttons{
    float:left;
    width: 42px;
    height: 36px;
    text-align:center;
    background-color:lightgray;
    margin: 0 17px 20px 0;
}
    531ac245ce3e4fe3d50054a55f265927

javascript程式碼如下：

<script>
        var num = 0;  // 定义第一个输入的数据
        function jsq(num) {
            //获取当前输入
			if(num=="%"){
				document.getElementById(&#39;screenName&#39;).value=Math.round(document.getElementById(&#39;screenName&#39;).value)/100;
			}else{
				document.getElementById(&#39;screenName&#39;).value += document.getElementById(num).value;
			}
        }
        function eva() {
            //计算输入结果
            document.getElementById("screenName").value = eval(document.getElementById("screenName").value);
        }
        function clearNum() {
            //清0
            document.getElementById("screenName").value = null;
            document.getElementById("screenName").focus();
        }
        function tuiGe() {
            //退格
            var arr = document.getElementById("screenName");
            arr.value = arr.value.substring(0, arr.value.length - 1);
        }
    </script>

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