html+css实现一个好看的计算器实例代码

最终效果如下图-2，有bug：就是整数后点击%号结果正确，如果小数后面点击%的话结果就错误！其他都正常，求指点：input的value是string类型的，在JS中改如何正确处理下图-1中的if部分？？

图-1

图-2

HTML代码如下

6c04bd5ca3fcae76e30b72ad730ca86d99afb4a0ec78806987e189e4c98398ea
    6eed0752efaf084fb70976dddbedd34a
        0c689d943f73a1c092c31716bd34abcf简单的计算器54bdf357c58b8a65c66d7c19c8e4d114
        09283fc524a4a36c146c764949aa242f@walker54bdf357c58b8a65c66d7c19c8e4d114
    94b3e26ee717c64999d7867364b1b4a3
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        98799819c3ca063458af76c1c0c158a4
            bfa0a8d425fe9a3229798d95cee15aaa
        94b3e26ee717c64999d7867364b1b4a3
    94b3e26ee717c64999d7867364b1b4a3
    fa1564eb50cd496f5a54da14b70f3731
        8bd12a904b5d9201505108402ae9ca00
        01af2567ae295c11fcca7bcb65849a40
        79bbb341fe414a74021b0e8d5a2c72c2
        e88e7be8536984758a184c7eea3ef701
        9c26a78a7f8bde1e3d2efe6820e50178
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        1bbae22b4a04bbb75c7c1f4a0ff3417b
        fbdd6c8cd401baffbf0f9e7071905aca
        9500030dfc6788d9b162467c0947683c
        eb6f00fdc0aaf2a28f6e3281f2763846
        08b2cde8095433d655b45a09719d73d7
        d296c2f21cf91f82002bc7c047cfa414
        26b9cd665a6ba1e48ef2e1e09a967b04
        38714593b7af3dbf30824b049c29c6b0
        bfeb4fda949ce9cf028ae94b96b103a9
        bd611b73f12920f7c112afc4364a3b92
        094534c054422ede9118d7836b696876
        62126d533680ecb235bebf919bc5bdd3
        16ab8776b06225c12d9d7f5e600537f8
        1e1575dba18673437b2a13f7f25b6c30
        503dcccdbdff0d6f710ee91a7ffc8d97
        a8c2d5a4860de0a891af473e29f0ccb1
        bbe1fc9bab6b3868339cbbaea59523fc
        60c0655510ce26792b889a4a5cfc2cb0
        bf234edee30f46b59214666e18c32ac0
    94b3e26ee717c64999d7867364b1b4a3
    7bcffe5f516221485a783f8c6abf3ffe
        c0ffcba5f60278bc3e0b127e4bd66c09欢迎使用JavaScript计算器54bdf357c58b8a65c66d7c19c8e4d114
            095b885e2899edf327d7d75922364d26
                27c2b160b1f3514b8ab408eba144b76c反馈5db79b134e9f6b82c0b36e0489ee08ed
            54bdf357c58b8a65c66d7c19c8e4d114
    94b3e26ee717c64999d7867364b1b4a394b3e26ee717c64999d7867364b1b4a336cc49f0c466276486e50c850b7e4956

CSS代码如下：

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代码如下：

<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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