效果圖:
剛開始做時沒考慮到清零和退格兩個功能,嘻嘻,後來加的整體與傳統計算器比有點小瑕疵。
代碼:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>js簡單計算器</title> <style type="text/css"> *{ margin:0px; padding:0px; } input{ margin-top:2px; margin-left:2px; width:230px; height:30px; text-align:right; } button{ margin-top:2px; margin-left:2px; width:50px; height:50px; } #container{ margin-left:1px; border:1px solid #E4E4E4; background:#BBBBBB; width:235px; height:215px; } </style> <script> function onLoad(){ //加載完畢後光標自動對應到輸入框 document.getElementById("input").focus(); } //讀取按鈕的值,傳給輸入框 function inputEvent(e){ //把val的值改為每個事件的innerHTML值 var val=e.innerHTML; //獲取input標簽 var xsval=document.getElementById("input"); //標簽裡的value連接每個事件的innerHTML值 xsval.value+=val; } //計算出結果 function inputOper(){ var xsval=document.getElementById("input"); xsval.value=eval(document.getElementById("input").value); } //清零 function clearNum(){ var xsval=document.getElementById("input"); xsval.value=""; document.getElementById("input").focus(); } //退格 function backNum(){ var arr=document.getElementById("input"); arr.value=arr.value.substring(0,arr.value.length-1); }
</script> </head> <body onload="onLoad()"> <input id="input" type="text"> <div id="container"> <div> <button onclick="inputEvent(this)">1</button> <button onclick="inputEvent(this)">2</button> <button onclick="inputEvent(this)">3</button> <button onclick="inputEvent(this)">+</button> </div> <div> <button onclick="inputEvent(this)">4</button> <button onclick="inputEvent(this)">5</button> <button onclick="inputEvent(this)">6</button> <button onclick="inputEvent(this)">-</button> </div> <div> <button onclick="inputEvent(this)">7</button> <button onclick="inputEvent(this)">8</button> <button onclick="inputEvent(this)">9</button> <button onclick="inputEvent(this)">*</button> </div> <div> <button onclick="inputEvent(this)">0</button> <button onclick="inputEvent(this)">.</button> <button onclick="inputOper(this)">=</button> <button onclick="inputEvent(this)">/</button> </div> </div> <button onclick="clearNum()">清零</button> <button onclick="backNum()">退格</button> </body> </html>
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