使用JavaScript 编写简单计算器

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我是靠谱客的博主受伤泥猴桃，最近开发中收集的这篇文章主要介绍使用JavaScript 编写简单计算器，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

本文方法超级简单，思路非常的值得推荐，小伙伴们参考下吧

复制代码代码如下:

<!DOCTYPE html> 

<html> 

<head> 

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  

    <title>javascript 简单计算器</title> 

    <script> 

        //定义全局变量         var one="1"; 

        var two="2"; 

        var three="3"; 

        var four="4"; 

        var five="5"; 

        var six="6"; 

        var seven="7"; 

        var eight="8"; 

        var nine="9"; 

        var zero="0"; 

         var plus="+",minus="-",multiply="*",divide="/",decimal="."; 

         function enter(obj,string){ 

                obj.expr.value+=string; 

            } 

         function compute(obj){//单击等于"="按钮调用的函数;                  obj.expr.value=eval(obj.expr.value);//用JS得eval()方法计算name为expr中的公式              } 

  </script> 

</head> 

<body> 

    <form name="calc" id="calc" action="">  

        <table border="1">  

        <td colspan="4"><input type="text" name="expr" size="30" action="compute(this.form)" /></td>  

        <tr>  

        <td><input type="button" value=" 7 " onclick="enter(this.form,seven)" /></td>  

        <td><input type="button" value=" 8 " onclick="enter(this.form,eight)" /></td>  

        <td><input type="button" value=" 9 " onclick="enter(this.form,nine)" /></td>  

        <td><input type="button" value=" / " onclick="enter(this.form,divide)" /></td>  

        </tr>  

        <tr>  

        <td><input type="button" value=" 4 " onclick="enter(this.form,four)" /></td>  

        <td><input type="button" value=" 5 " onclick="enter(this.form,five)" /></td>  

        <td><input type="button" value=" 6 " onclick="enter(this.form,six)" /></td>  

        <td><input type="button" value=" * " onclick="enter(this.form,multiply)" /></td>  

        </tr>  

        <tr>  

        <td><input type="button" value=" 1 " onclick="enter(this.form,one)" /></td>  

        <td><input type="button" value=" 2 " onclick="enter(this.form,two)" /></td>  

        <td><input type="button" value=" 3 " onclick="enter(this.form,three)" /></td>  

        <td><input type="button" value=" - " onclick="enter(this.form,minus)" /></td>  

        </tr>  

        <tr>  

        <td colspan="2"><input type="button" value=" 0 " onclick="enter(this.form,zero)" /></td>  

        <td><input type="button" value=" . " onclick="enter(this.form,decimal)" /></td>  

        <td><input type="button" value=" + " onclick="enter(this.form,plus)" /></td>  

        </tr>  

        <tr>  

        <td colspan="2"><input type="button" value=" = " onclick="compute(this.form)" /></td>  

        <td colspan="2"><input type="button" value="AC" onclick="form.reset()"/></td>  

        </tr>  

        </table>  

</form>  

</body> 

</html>