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javascript开发计算器之JS代码

前面介绍了HTML,下面我们主要说一下JS代码的写法:

<!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>

每个功能都会有注释。由于语音素材无法上传,所以知道写法就可以了,可以自己在网上下载声音素材,自己尝试一下。

nächsten Abschnitt
<!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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