基于javascript的简易计算器

来源：互联网发布：剑灵热巴数据编辑：程序博客网时间：2024/04/30 01:10

<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>

<body> <center><div id="calculator">    <div id="shuRu">        <div>            <input type="text" id="screenName" name="screenName" style="width:233;">        </div>    </div>    <div id="keys">        <div>        <input type="button" id="7" onclick="jsq(this.id)" value="7" style="width:40;">        <input type="button" id="8" onclick="jsq(this.id)" value="8"  style="width:40;">        <input type="button" id="9" onclick="jsq(this.id)" value="9" style="width:40;">        <input type="button" id="Back" onclick="tuiGe()" value="Back" style="width:40;">        <input type="button" id="C" onclick="clearNum()" value="C" style="width:40;">        </div>        <div>        <input type="button" id="4" onclick="jsq(this.id)" value="4" style="width:40;">        <input type="button" id="5" onclick="jsq(this.id)" value="5" style="width:40;">        <input type="button" id="6" onclick="jsq(this.id)" value="6" style="width:40;">        <input type="button" id="*" onclick="jsq(this.id)" value="*" style="width:40;">        <input type="button" id="/" onclick="jsq(this.id)" value="/" style="width:40;">        </div>        <div>        <input type="button" id="1" onclick="jsq(this.id)" value="1" style="width:40;">        <input type="button" id="2" onclick="jsq(this.id)" value="2" style="width:40;">        <input type="button" id="3" onclick="jsq(this.id)" value="3" style="width:40;">        <input type="button" id="+" onclick="jsq(this.id)" value="+" style="width:40;">        <input type="button" id="-" onclick="jsq(this.id)" value="-" style="width:40;">        </div>        <div>        <input type="button" id="0" onclick="jsq(this.id)" value="0" style="width:40;">        <input type="button" id="00" onclick="jsq(this.id)" value="00" style="width:40;">        <input type="button" id="." onclick="jsq(this.id)" value="." style="width:40;">        <input type="button" id="%" onclick="jsq(this.id)" value="%" style="width:40;">        <input type="button" id="eva" onclick="eva()" value="=" class="buttons" style="width:40;">        </div>    </div></div></center></body>

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