tipweb.github.io/jisuanqi.html at master · tipweb/tipweb.github.io · GitHub

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<!DOCTYPE html>
<html>
<head>
	<title>计算器</title>
    <style type="text/css">
    	table{

    		margin:0 auto;

    	}

    	.but_ac{
    		width: 80px;
    		height: 60px;
    		background-color : lightgray;
    		font-size: 1.2em;
    	}
    	.but{
    		width: 80px;
    		height: 60px;
    		background-color : lightgray;
    		font-size: 1.2em;
    	}
    	.screen{
    		width: 350px;
            height: 70px;
            font-size: 1.5em;
            color: white;
            background-color: black;
            text-align:right;
    	}

    </style>

    <script type="text/javascript">
    	window.onload=function(){
    	   var result;
           var str=[];
    	   var num=document.getElementsByClassName("but");
    	   var scr=document.getElementsByClassName("screen")[0];
           for(var i=0;i<num.length;i++)
           {

            	num[i].onclick=function(){

                if(this.value=="AC"){
    	   	    	scr.value="";
    	     	  }
    	     	else if( this.value=="+/-"){
    	     		if(scr.value=="")
    	     		{
    	     			scr.value="";
    	     		}
    	     		else if(isNaN(scr.value.charAt(scr.value.length-1))==false&&isNaN(scr.value.charAt(scr.value.length-2))==true)
    	     		{
    	     			scr.value=scr.value.substr(0,scr.value.length-1)+"("+"-"+scr.value.charAt(scr.value.length-1)+")";
    	     		}
     	     	  }

    	   	    else if (this.value=="<—"&&this.value!=""){
                  scr.value=scr.value.substr(0,scr.value.length-1);
    	   	    }
        		else if(scr.value==""&&this.value=="."){
        		 	 scr.value="0.";
        		 }
        		else if(this.value=="="){
                    scr.value=eval(scr.value);
                 }
                 else if(scr.value==""&&(this.value=="+"||this.value=="-"||this.value=="*"||this.value=="/"))
                 	{
                 		scr.value=="";
                 	}

               else
                 {
                 	scr.value+=this.value;
                 }
        	}
         }

    }

    </script>

</head>
<body>
 <table>
      <tr>
          <td colspan="4"><input class="screen" type="text" disabled /></td>
      </tr>
      <tr>
      	<td><input class="but_ac but" type="button" value="AC" style="color: orange"></td>
      	<td><input class="but_ac but" type="button" value="<—" style="color: orange"></td>
      	<td><input class="but" type="button" value="+/-"></td>
      	<td><input class="but" type="button" value="/"></td>
      </tr>
      <tr>
      	<td><input class="but" type="button" value="7"></td>
      	<td><input class="but" type="button" value="8"></td>
      	<td><input class="but" type="button" value="9"></td>
      	<td><input class="but" type="button" value="*"></td>
      </tr>
      <tr>
      	<td><input class="but" type="button" value="4"></td>
      	<td><input class="but" type="button" value="5"></td>
      	<td><input class="but" type="button" value="6"></td>
      	<td><input class="but" type="button" value="-"></td>
      </tr>
      <tr>
      	<td><input class="but" type="button" value="1"></td>
      	<td><input class="but" type="button" value="2"></td>
      	<td><input class="but" type="button" value="3"></td>
      	<td><input class="but" type="button" value="+"></td>
      </tr>
      <tr>
      	<td colspan="2"><input class="but" type="button" value="0" style="width: 180px"></td>
      	<td><input class="but" type="button" value="."></td>
      	<td><input class="but" type="button" value="=" style="background-color:orange ;color:white"></td>
      </tr>


</table>

</body>
</html>