javascript编写简易计算器

时间：2021-05-26

本文实例为大家分享了js简易计算器的具体代码，供大家参考，具体内容如下

代码如下

<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>简易计算器</title> <style type="text/css"> *{ margin:0; padding: 0; } .content{ width: 300px; height: 400px; margin: 50px auto; background: #CBC6C6; border:1px solid #139EB7; box-shadow: -5px -5px 5px #565454; border-radius: 15px; } #toptext{ width: 280px; height: 50px; margin: 10px auto; margin-left: 9px; line-height: 50px; border-radius: 15px; text-align: right; font-size: 24px; border: 1px #F0D711 solid; } .btns{ width: 280px; height: 300px; margin: 10px auto; } .btns input{ width: 50px; margin: 10px; height: 60px; float: left; font-size: 24px; line-height: 60px; border-radius: 10px; transform-origin: left top; background: linear-gradient(to right,#0df60d,red); } .btns input:hover{ background: linear-gradient(to left,#0df60d,red); transform: rotate(15deg); } </style></head><body> <div class="content"> <input type="text" id="toptext"> <div class="btns"> <input type="button" value="1" class="num"> <input type="button" value="2" class="num"> <input type="button" value="3" class="num"> <input type="button" value="+" class="jisuan"> <input type="button" value="4" class="num"> <input type="button" value="5" class="num"> <input type="button" value="6" class="num"> <input type="button" value="-" class="jisuan"> <input type="button" value="7" class="num"> <input type="button" value="8" class="num"> <input type="button" value="9" class="num"> <input type="button" value="*" class="jisuan"> <input type="button" value="0" class="num"> <input type="button" value="C" id="clear"> <input type="button" value="=" id="equals"> <input type="button" value="/" class="jisuan"> </div> </div> <script type="text/javascript"> var text = document.getElementsByTagName('input')[0]; var clear = document.getElementById('clear'); var equals = document.getElementById('equals'); var js = document.getElementsByClassName('jisuan'); var num = document.getElementsByClassName('num'); text.value = 0; var tex = ""; var fuhao = ""; var firstNum = ""; var secondNum = ""; for(var i=0 ; i<num.length; i++){ num[i].onclick = function (){ if(fuhao){ text.value += this.value; secondNum = this.value; }else{ tex = tex+this.value; firstNum = tex; text.value = tex; } }; } for(var j=0; j<js.length; j++){ js[j].onclick = function(){ fuhao = this.value; text.value += this.value; }; } equals.onclick=function(){ switch (fuhao) { case '+': var res = firstNum*1 + secondNum*1; break; case '-': var res = firstNum - secondNum; break; case '*': var res = firstNum * secondNum; break; case '/': var res = firstNum / secondNum; break; default: break; } text.value = res; tex = ""; fuhao = ""; firstNum = ""; secondNum = ""; } clear.onclick = function(){ text.value = ""; } </script></body></html>

界面：

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。

声明：本页内容来源网络，仅供用户参考；我单位不保证亦不表示资料全面及准确无误，也不保证亦不表示这些资料为最新信息，如因任何原因，本网内容或者用户因倚赖本网内容造成任何损失或损害，我单位将不会负任何法律责任。如涉及版权问题，请提交至online#300.cn邮箱联系删除。

相关文章