button type="button" οnclick="add()" + /button button type="button" οnclick="substract()" - /button button type="button" οnclick="multiply()" * /button button type="button" οnclick="divide()" / /button /td /tr td colspan="2" p id="result" /p /td /tr /table script var res; //保存计算结果 function add() var first = document.getElementById("fir").value; var second = document.getElementById("sec").value; res = Number(first) + Number(second); //这里"+"两端必须Number类型转换，否则当成字符串连接 sent(res); function substract() var first = document.getElementById("fir").value; var second = document.getElementById("sec").value; res = first - second; sent(res); function multiply() var first = document.getElementById("fir").value; var second = document.getElementById("sec").value; res = first * second; sent(res); function divide() var first = document.getElementById("fir").value; var second = document.getElementById("sec").value; res = first / second; sent(res); function sent(re) document.getElementById("result").innerHTML = re; /script /body /html
output:
更多计算器功能实现，请点击专题： 进行学习
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凡科。