html+js實現簡單的計算器代碼(加減乘除)

2019-11-20 09:30:25

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html+js實現簡單的計算器代碼(加減乘除)

<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title></title></head><body><table>  <tr>   <td><input type="button" value="add"   onclick="setOp('+', 'add');"/></td>   <td><input type="button" value="miner" onclick="setOp('-', 'miner');"/></td>   <td><input type="button" value="times" onclick="setOp('*', 'times');"/></td>   <td><input type="button" value="divide" onclick="setOp('/', 'divide');"/></td>  </tr></table><table id="tb_calc" style="display:none;">   <tr>    <td> <input id="x" type="text" style="width:100px" value="" name="x" /></td>    <td> <lable id="op" name="op"></lable> </td>    <td> <input id="y" type="text" style="width:100px" value="" name="y" /> </td>    <td> <input id="opTips" type="button" value="" onclick="calc();"/> </td>    <td> <lable id="z" name="z"></lable> </td>  </tr></table><script type="application/javascript">  function setOp(op, opTips)  {    var tb=document.getElementById("tb_calc");    tb.style.display = "none";              document.getElementById("x").value = "";     document.getElementById("y").value = "";     document.getElementById("z").innerText = "";     document.getElementById("op").innerText = op;    document.getElementById("opTips").value = opTips;        tb.style.display = "block";  }  function calc()  {    var x = parseInt(document.getElementById("x").value);     var y = parseInt(document.getElementById("y").value);    var op = document.getElementById("op").innerText;        var z = "";    switch(op)    {      case '+':        z = x + y;        break;      case '-':        z = x - y;        break;      case '*': ;        z = x * y;        break;      case '/': ;        z = x / y;        break;      default:        z = '';    }    console.log(x, op, y, '=', z);    document.getElementById("z").innerText = z;  }</script></body></html>

截圖如下：