<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>计算器</title><script> function calc() { var x = parseInt(document.getElementById('sum1').value); var y = parseInt(document.getElementById('sum2').value); var fuhao = parseInt(document.getElementById('sym').value); var he; switch(fuhao){ case '+': he=x+y; break; case '-': he=x-y; break; case '*': he=x*y; break; case '/': he=x/y; break; } document.getElementById('sum').value=he; }</script></head><body> <input type="text" id="sum1"> <select name="" id="sym"> <option value="+">+</option> <option value="-">-</option> <option value="*">*</option> <option value="/">/</option> </select> <input type="text" id="sum2"> <input type="button" value=" = " onclick="calc()"> <input type="text" id="sum"></body></html>
添加回答
举报
0/150
提交
取消