本文实例为大家分享了JavaScript实现简易计算器的具体代码,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" > < title >计算器</ title > </ head > < body > <!--页面布局--> < input type = "text" id = "num1" placeholder = "请输入第一个数字" /> < input type = "text" id = "operator" placeholder = "请输入运算符" > < input type = "text" id = "num2" placeholder = "请输入第二个数字" /> < input type = "button" onclick = "count()" value = "计算" />< br /> < span >计算结果:</ span >< span id = "result" ></ span > <!--JavaScript--> < script > function count() { var num1 = document.getElementById("num1").value; var num2 = document.getElementById("num2").value; var operator = document.getElementById("operator").value; var num = ""; //判断输入的两个数字是否为数字,如果为数字,返回结果为false var num1 = parseFloat(num1); var num2 = parseFloat(num2); var isNotNumber = isNaN(num1) || isNaN(num2); if (!isNotNumber) { switch (operator) { case "+": num = num1 + num2; break; case "-": num = num1 - num2; break; case "*": num = num1 * num2; break; case "/": if (num2 == 0) { // 除数不能为0 alert("除数不能为0"); } else { num = num1 / num2; break; } default: alert("请输入正确的运算符!!!"); } num = num.toFixed(2); document.getElementById("result").innerText = num; } else { alert("请输入数字!!!") } } </ script > </ body > </ html > |
运行效果:
测试结果:
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服务器之家。
原文链接:https://blog.csdn.net/m0_49926319/article/details/109191657