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js实现一个简易的计算器

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利用原生js实现一个简易的计算器(附详细注释),供大家参考,具体内容如下 。

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<!DOCTYPE html>
< html lang = "en" >
   < head >
     < meta charset = "UTF-8" />
     < meta name = "viewport" content = "width=device-width, initial-scale=1.0" />
     < title >Document</ title >
     < style >
       .divs {
         width: 500px;
         height: 600px;
         border: 1px solid #000000;
         margin: auto;
       }
       .divs > input {
         width: 460px;
         height: 45px;
         margin-left: 18px;
         margin-top: 10px;
         font-size: 30px;
         background-color: white;
         text-align: right;
       }
       .divs > div {
         width: 100px;
         height: 100px;
         float: left;
         border: 1px solid #000000;
         margin-left: 18px;
         margin-top: 25px;
         font-size: 40px;
         line-height: 100px;
         text-align: center;
         user-select: none;
       }
     </ style >
   </ head >
   < body >
     < div class = "divs" >
       < input type = "text" value = "0" id = "input1" disabled />
       < div class = "block" >7</ div >
       < div class = "block" >8</ div >
       < div class = "block" >9</ div >
       < div class = "block" >-</ div >
       < div class = "block" >4</ div >
       < div class = "block" >5</ div >
       < div class = "block" >6</ div >
       < div class = "block" >+</ div >
       < div class = "block" >1</ div >
       < div class = "block" >2</ div >
       < div class = "block" >3</ div >
       < div class = "block" >*</ div >
       < div class = "block" >C</ div >
       < div class = "block" >0</ div >
       < div class = "block" >=</ div >
       < div class = "block" >/</ div >
</ div >

js

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<script>
       // 获取到所有类名为block的元素
       var blocks = document.getElementsByClassName( "block" );
       // 获取到input
       var input = document.getElementById( "input1" );
       // 声明第一个数值
       var firstValue = 0,
         bool = false ;
       // 声明运算符
       var type;
       for ( var i = 0; i < blocks.length; i++) {
        //点击第i个block
         blocks[i].onclick = function () {
           //点击谁,this就指向谁,在这里this指向每次点击的元素
           console.log( this );
           //this.innerHTML显示点击的div里面的内容(比如1,2,3,-,+)
           //判断点击的为数字的情况(不是NaN,就是数字)
           if (!isNaN( this .innerHTML)) {     
             // bool初始为false,当bool为false时,可以不断输入,当bool为true时,input清空为0
             if (bool) {
               input.value = "0" ;
               bool = false ;
             }
             // 将input中的value累加点击的内容,将它强转为数字是为了去掉最前面的0,最后再转为字符
             input.value = Number(input.value + this .innerHTML).toString();
           } else {
            //判断点击为+ - * /的情况
             if ( this .innerHTML !== "C" && this .innerHTML !== "=" ) {
               //将第一个数存到firstValue
               firstValue = Number(input.value);
               //将运算符存到type
               type = this .innerHTML;
               //将input中的value重置为0
               input.value = "0" ;
             } else if ( this .innerHTML === "C" ) {  //判断点击C的情况
               // 全都重置
               firstValue = 0;
               type = undefined;
               input.value = "0" ;
             } else //判断点击=的情况
               //根据运算符的类型进行运算
               switch (type) {
                 case "+" :
                   input.value = (firstValue + Number(input.value)).toString();
                   break ;
                 case "-" :
                   input.value = (firstValue - Number(input.value)).toString();
                   break ;
                 case "*" :
                   input.value = (firstValue * Number(input.value)).toString();
                   break ;
                 case "/" :
                   // 除数为0时重置input.value
                   if (Number(input.value) === 0) input.value = "0" ;
                   else
                     input.value = (firstValue / Number(input.value)).toString();
                   break ;
               }
               //bool为true时,点击"="后,当再次输入时,input.value为0
               bool = true ;
             }
           }
         };
       }

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我.

原文链接:https://blog.csdn.net/nqq0921/article/details/115536722 。

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