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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
<body> <div id="calculator"> <div class="LOGO"> <span class="name">简单的计算器</span> <span class="verson">@walker</span> </div> <div id="shuRu"> <!--screen输入栏--> <div class="screen"> <input type="text" id="screenName" name="screenName" class="screen"> </div> </div> <div id="keys"> <!-- j --> <!--第一排--> <input type="button" id="7" onclick="jsq(this.id)" value="7" class="buttons"> <input type="button" id="8" onclick="jsq(this.id)" value="8" class="buttons"> <input type="button" id="9" onclick="jsq(this.id)" value="9" class="buttons"> <input type="button" id="Back" onclick="tuiGe()" value="Back" class="buttons"> <input type="button" id="C" onclick="clearNum()" value="C" class="buttons" style="margin-right:0px"> <!--第二排--> <input type="button" id="4" onclick="jsq(this.id)" value="4" class="buttons"> <input type="button" id="5" onclick="jsq(this.id)" value="5" class="buttons"> <input type="button" id="6" onclick="jsq(this.id)" value="6" class="buttons"> <input type="button" id="*" onclick="jsq(this.id)" value="X" class="buttons"> <input type="button" id="/" onclick="jsq(this.id)" value="/" class="buttons" style="margin-right:0px"> <!--第三排--> <input type="button" id="1" onclick="jsq(this.id)" value="1" class="buttons"> <input type="button" id="2" onclick="jsq(this.id)" value="2" class="buttons"> <input type="button" id="3" onclick="jsq(this.id)" value="3" class="buttons"> <input type="button" id="+" onclick="jsq(this.id)" value="+" class="buttons"> <input type="button" id="-" onclick="jsq(this.id)" value="-" class="buttons" style="margin-right:0px"> <!--第四排--> <input type="button" id="0" onclick="jsq(this.id)" value="0" class="buttons"> <input type="button" id="00" onclick="jsq(this.id)" value="00" class="buttons"> <input type="button" id="." onclick="jsq(this.id)" value="." class="buttons"> <input type="button" id="%" onclick="jsq(this.id)" value="%" class="buttons"> <input type="button" id="eva" onclick="eva()" value="=" class="buttons" style="margin-right:0px"> </div> <div class="footer"> <span class="aside">欢迎使用JavaScript计算器</span> <span class="link"> <a href="#" title="声明" target="_blank">反馈</a> </span> </div> </div> </body>
CSS代码如下：
<style> /*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; } </style>
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(‘screenName‘).value=Math.round(document.getElementById(‘screenName‘).value)/100;
}else{
document.getElementById(‘screenName‘).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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原文地址：http://www.cnblogs.com/-walker/p/4996368.html
