自己写的一个计算器 <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gbk"> <title>计算器</title> </head> <body bgcolor="Silver"> <center> All world will give way to you,if you know where is you go. <hr> <span id = "dengyu" style="color: green;font-size: xx-large" mce_style="color: green;font-size: xx-large"></span> <span id = "tai" style="color: green;font-size: xx-large" mce_style="color: green;font-size: xx-large"></span> <span id = "math" style="color: green;font-size: xx-large" mce_style="color: green;font-size: xx-large"></span> <span id = "cumt" style="color: green;font-size: xx-large" mce_style="color: green;font-size: xx-large"></span> <hr> <br> <table> <tr> <td><input type = "button" style="25px" value = "1" onclick="numClk(this)"> </td> <td><input type = "button" style="25px" value = "2" onclick="numClk(this)"> </td> <td><input type = "button" style="25px" value = "3" onclick="numClk(this)"> </td> <td><input type = "button" style="25px" value = "+" onclick="mathClk(this)"> </td> </tr> <tr> <td><input type = "button" style="25px" value = "4" onclick="numClk(this)"> </td> <td><input type = "button" style="25px" value = "5" onclick="numClk(this)"> </td> <td><input type = "button" style="25px" value = "6" onclick="numClk(this)"> </td> <td><input type = "button" style="25px" value = "-" onclick="mathClk(this)"> </td> </tr> <tr> <td><input type = "button" style="25px" value = "7" onclick="numClk(this)"> </td> <td><input type = "button" style="25px" value = "8" onclick="numClk(this)"> </td> <td><input type = "button" style="25px" value = "9" onclick="numClk(this)"> </td> <td><input type = "button" style="25px" value = "*" onclick="mathClk(this)"> </td> </tr> <tr> <td><input type = "button" style="25px" value = "0" onclick="numClk(this)"> </td> <td><input type = "button" style="25px" value = "=" onclick="resultClk()"> </td> <td><input type = "button" style="25px" value = "邰" onclick="writ()"> </td> <td><input type = "button" style="25px" value = "/" onclick="mathClk(this)"> </td> </tr> </table> <br><br> <hr> <span id = "hangzhou" style="font-size: large;font: normal;" mce_style="font-size: large;font: normal;"></span> </center> </body> <script type="text/javascript"> var span_cumt = document.getElementById("cumt"); var span_tai = document.getElementById("tai"); var span_math = document.getElementById("math"); var span_dengyu = document.getElementById("dengyu"); var span_hangzhou = document.getElementById("hangzhou"); //数字按钮的点击事件 function numClk(obj){ span_cumt.innerHTML = span_cumt.innerHTML + obj.value; } //加减乘除按钮的点击事件 function mathClk(obj){ if(span_tai.innerHTML == ""){ span_tai.innerHTML = span_cumt.innerHTML; } span_cumt.innerHTML = ""; span_math.innerHTML = obj.value; span_dengyu.innerHTML = ""; } //等号按钮的点击事件 function resultClk(){ span_hangzhou.innerHTML = span_hangzhou.innerHTML + "<br>" + span_tai.innerHTML + " " + span_math.innerHTML + " " + span_cumt.innerHTML +" = "; var jieguo = eval(span_tai.innerHTML + span_math.innerHTML + span_cumt.innerHTML); span_hangzhou.innerHTML = span_hangzhou.innerHTML + jieguo; span_tai.innerHTML = jieguo; span_cumt.innerHTML = ""; span_math.innerHTML = ""; span_dengyu.innerHTML = "="; } //小数点按钮的点击事件 function writ(){ span_dengyu.innerHTML = ""; span_tai.innerHTML = ""; span_math.innerHTML = ""; span_cumt.innerHTML = ""; span_hangzhou.innerHTML = ""; } </script> </html>