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JavaScript計算器網(wǎng)頁版實(shí)現(xiàn)代碼分享

 更新時間:2016年07月15日 09:04:14   作者:qq_34416191  
這篇文章主要為大家詳細(xì)介紹了JavaScript計算器網(wǎng)頁版實(shí)現(xiàn)代碼,文中示例代碼介紹的非常詳細(xì),具有一定的參考價值,感興趣的小伙伴們可以參考一下

JavaScript網(wǎng)頁計算器代碼,該計算器是用DW寫的!

HTML篇

<html
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>計算器</title>
<link href="style/calculator.css" rel="stylesheet" type="text/css" />
<script src="JavaScript/calculator.js"></script>>
</head>

<body >
<form id="form1" name="form1" method="post" action="">
 <table width="320" border="1" cellpadding="0" cellspacing="0" class="trb" id="calculator">
 <tr>
  <td height="100" colspan="4" align="left" valign="top"><label for="txt"></label>
  <input name="txt" type="text" class="txt" id="txt" value="0" onfocus="this.blur();"/></td>
 </tr>
 <tr>
  <td width="80" height="40" align="center" valign="middle" onclick="deleteAll();">C</td>
  <td width="80" height="40" align="center" valign="middle" onclick="Backspace();">←</td>
  <td width="80" height="40" align="center" valign="middle" onclick="sign();">±</td>
  <td width="80" height="40" align="center" valign="middle" class="operator" onclick="add();">+</td>
 </tr>
 <tr>
  <td width="80" height="40" align="center" valign="middle" onclick="command(7);">7</td>
  <td width="80" height="40" align="center" valign="middle" onclick="command(8);">8</td>
  <td width="80" height="40" align="center" valign="middle" onclick="command(9);">9</td>
  <td width="80" height="40" align="center" valign="middle" class="operator" onclick="subtract();">-</td>
 </tr>
 <tr>
  <td width="80" height="40" align="center" valign="middle" onclick="command(4);">4</td>
  <td width="80" height="40" align="center" valign="middle" onclick="command(5);">5</td>
  <td width="80" height="40" align="center" valign="middle" onclick="command(6);">6</td>
  <td width="80" height="40" align="center" valign="middle" class="operator" onclick="multiply();">×</td>
 </tr>
 <tr>
  <td width="80" height="40" align="center" valign="middle" onclick="command(1);">1</td>
  <td width="80" height="40" align="center" valign="middle" onclick="command(2);">2</td>
  <td width="80" height="40" align="center" valign="middle" onclick="command(3);">3</td>
  <td width="80" height="40" align="center" valign="middle" class="operator" onclick="divide();">÷</td>
 </tr>
 <tr>
  <td width="80" height="40" align="center" valign="middle" onclick="command(0);">0</td>
  <td width="80" height="40" align="center" valign="middle" onclick="dot();">▪</td>
  <td height="40" colspan="2" align="center" valign="middle" bgcolor="#CC6600" onclick="equal();">=</td>
 </tr>
 </table>
 <p> </p>
 <p> </p>
</form>
</body>
</html>

CSS篇

@charset "utf-8";
/* CSS Document */

.trb {
 font-family: Georgia, "Times New Roman", Times, serif;
 font-size: 24px;
 color: #FFF;
 background-color: #333;
 text-align: center;
 border: 1px solid #999;
}
.operator {
 background-color: #333;
 font-size: 18px;
 color: #C60;
 font-family: Verdana, Geneva, sans-serif;
}
td:hover{ 
 font-size: 28px;
 cursor:pointer; 
}
.txt {
 height: 100px;
 width: 320px;
 background-color: #333;
 text-align: left;
 vertical-align: bottom;
 color: #FFF;
 font-size: 30px;
}

 JavaScript篇

 //實(shí)現(xiàn)計算器功能

//結(jié)果
var result = 0;
//顯示框中的數(shù)(默認(rèn)為“0”)
var screenNum = "0";
//數(shù)的初始輸入狀態(tài),默認(rèn)為0;當(dāng)按了任意運(yùn)算符鍵后,數(shù)的輸入狀態(tài)變?yōu)?
var state = 0;
//防止重復(fù)按運(yùn)算符鍵
var avoidRepeat = true;
//運(yùn)算符鍵(默認(rèn)為0--等于號)
var operator = 0;

//第一步:獲取按鍵值,并顯示在顯示框中
function command(num) {
 //獲取顯示框的值
 var str = String(document.form1.txt.value);
 //對該值進(jìn)行判斷,如果該值不為"0",且輸入狀態(tài)0,則返回前者,否則為""(雙重三目運(yùn)算)
 //兩個判斷條件:1、顯示框中值是否為"0", 2、數(shù)的輸入狀態(tài)
 str = (str != "0")?((state == 0)?str:""):"";
 //給當(dāng)前值追加字符
 str = str + String(num);
 //刷新顯示
 document.form1.txt.value = str;
 //按了任意數(shù)字鍵后,數(shù)的輸入狀態(tài)變?yōu)?
 state = 0;
 //重置防止重復(fù)按鍵
 avoidRepeat = true;
}

//第二步:確保輸入的數(shù)是合法的,每個數(shù)至多只有一個小數(shù)點(diǎn)
function dot() {
 var str = String(document.form1.txt.value);
 //若該數(shù)前面未接運(yùn)算符,則返回前值,否則為"0";
 str = (state == 0)?str:"0";
 //Java里String有l(wèi)ength()方法,而JS里String有l(wèi)ength屬性
 for(i=0;i<=str.length;i++) {
 //substr()獲取下標(biāo)從i開始,個數(shù)為1個的子串
 if(str.substr(i,1)==".") {
 //當(dāng)存在小數(shù)點(diǎn)時,則程序終止
 return;
 } 
 }
 //若無小數(shù)點(diǎn),則在該數(shù)后面加上
 str = str+".";
 //刷新顯示
 document.form1.txt.value = str;
 //恢復(fù)數(shù)的初始輸入狀態(tài)
 state = 0;
 
}

//第三步:處理退格鍵
function Backspace() {
 var str= String(document.form1.txt.value);
 //若顯示框中數(shù)不等于"0",則返回str,否則返回""
 str = (str != "0")?str:"";
 //獲取子串
 str = str.substr(0,str.length-1);
 //若str不為"",則返回子串str,否則str="0"
 str = (str != "")?str:"0";
 //刷新顯示
 document.form1.txt.value = str;
 
}

//第四步:刪除所有
function deleteAll() {
 //顯示框設(shè)為"0"
 document.form1.txt.value = "0";
 //恢復(fù)數(shù)的初始輸入狀態(tài)
 state = 0;
 //恢復(fù)運(yùn)算符鍵,默認(rèn)為0--等于號
 operator = 0;
}

//第五步:加法
function add() {
 //調(diào)用計算函數(shù)
 calculate();
 //更改數(shù)的輸入狀態(tài)
 state = 1;
 //更改運(yùn)算符鍵,1--加號
 operator = 1;
 
}

//第六步:減法
function subtract() {
 //調(diào)用計算函數(shù)
 calculate();
 //更改數(shù)的輸入狀態(tài)
 state = 1;
 //2--減號
 operator = 2;
 
 
}

//第七步:乘法
function multiply() {
 //調(diào)用計算函數(shù)
 calculate();
 //更改數(shù)的輸入狀態(tài)
 state = 1;
 //3--乘號
 operator = 3;
 
}

//第八步:除法
function divide() {
 //調(diào)用計算函數(shù)
 calculate();
 //更改數(shù)的輸入狀態(tài)
 state = 1;
 //4--除號
 operator = 4;
 
}

//第九步:正負(fù)號
function sign() {
 //5--正負(fù)號
 operator = 5;
 //調(diào)用計算函數(shù)
 calculate();
 //更改數(shù)的輸入狀態(tài)
 state = 1;
 //0--等于號
 operator = 0;
 //正負(fù)號可以連續(xù)按
 avoidRepeat = true;

}

//第十步:等于
function equal() {
 //調(diào)用計算函數(shù)
 calculate();
 //更改數(shù)的輸入狀態(tài)
 state = 1;
 //0--等于號
 operator = 0;
 
 
}

//第十一步:計算
function calculate() {
 //獲取顯示框中的值
 screenNum = Number(document.form1.txt.value);
 if(avoidRepeat) { 
 switch(operator){
 case 1:
 result = result + screenNum;
 document.form1.txt.value = result;
 break;
 case 2:
 result = result - screenNum;
 document.form1.txt.value = result;
 break;
 case 3:
 result = result * screenNum;
 document.form1.txt.value = result;
 break;
 case 4:
 if(screenNum == 0){
  //設(shè)置顯示框的值
  document.getElementById("txt").value="除數(shù)不能為0";
  //3s后,執(zhí)行清屏函數(shù)
  setTimeout(clearScreen,3000);
 }else{
  result = result/screenNum;
  document.form1.txt.value = result;
 }
 break;
 case 5:
 result = (-1)*screenNum;
 document.form1.txt.value = result;
 break;
 case 0:
 result = screenNum;
 document.form1.txt.value = result;
 break;
 
 }
 //當(dāng)按了運(yùn)算符鍵后,不能再按
 avoidRepeat = false;
 }
 
}

//第十二步:清屏函數(shù)
function clearScreen() {
 document.getElementById("txt").value = "0";
 
}

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