JavaScript development calculator JS code

HTML was introduced earlier, now we mainly talk about how to write JS code:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <meta name="format-detection" content="telephone=no" />
    <title>计算器</title>
     <script type="text/javascript" src=""></script>
     <script>
 
  //点击按钮执行操作
  var resultDom = document.getElementById("result");   //var 是定义变量，
  var operate = true;                                 //定义一个变量，防止运算符的连续操作
  var xop = true;                                     //定义一个变量，防止小数点可以连续输出
  function command(num){                            //function 是封装command
    if(needclear==1){
      needclear=0;
      resultDom.value='';
    }
    var str = resultDom.value;                          
    str =(str =="0"?"":str);
    resultDom.value = str+num;
    operate = true;
    play(num);
  }
  
  //清空
  function clearzero(m){
      resultDom.value = 0;
 play(m)
  }
  
  //计算等号
  var needclear=0;
  function equal(m){
    needclear=1;
    var result = resultDom.value.toString();
    var r = eval(result);
    resultDom.value =r;
    play(m);
  }
  
  //小数点
  function dot(m){
  if(xop){                                             //对变量进行判断输出
  var num = resultDom.value.toString();
  num +=".";
  resultDom.value = num;
  xop = ture;
  }
  play(m);
  }
  
  
  //点击操作符
  function tools(op,m){
  if(operate){                                       //对运算符进行判断输出
  var num = resultDom.value;
  num = (num =="0"?"":num);
  resultDom.value = num+op;
  operate = false;
  }
  play(m);
  }
  
  //按键声音
  function play(num){
      var audioDom = document.getElementById("audio");
      audioDom.innerHTML = "<embed src='wav/"+num+".wav' width='0' height='0'></embed>"  //wav是声音素材的文件夹名称。
  }
  
  </script>
</body>
</html>

Each function will have comments. Since the voice material cannot be uploaded, you only need to know how to write it. You can download the voice material online and try it yourself.

Continuing Learning

new file

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"> <meta name="format-detection" content="telephone=no" /> <title>计算器</title> <script type="text/javascript" src=""></script> <script> //点击按钮执行操作 var resultDom = document.getElementById("result"); //var 是定义变量， var operate = true; var xop = true; function command(num){ if(needclear==1){ needclear=0; resultDom.value=''; } var str = resultDom.value; str =(str =="0"?"":str); resultDom.value = str+num; operate = true; play(num); } //清空 function clearzero(m){ resultDom.value = 0; play(m) } //计算等号 var needclear=0; function equal(m){ needclear=1; var result = resultDom.value.toString(); var r = eval(result); resultDom.value =r; play(m); } //小数点 function dot(m){ if(xop){ var num = resultDom.value.toString(); num +="."; resultDom.value = num; xop = ture; } play(m); } //点击操作符 function tools(op,m){ if(operate){ var num = resultDom.value; num = (num =="0"?"":num); resultDom.value = num+op; operate = false; } play(m); } //按键声音 function play(num){ var audioDom = document.getElementById("audio"); audioDom.innerHTML = "<embed src='wav/"+num+".wav' width='0' height='0'></embed>" } </script> </body> </html>

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