<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><script type="text/javascript">function count(){??? var num1=document.getElementById("num1").value ,??? symble=document.getElementById("symble"),??? num2=document.getElementById("num2").value ,??? result;??????? switch(symble){??????????? case"+":??????????? result=parseInt(num1)+parseInt(num2);??????????? break;??????????? case"-":??????????? result=parseInt(num1)-parseInt(num2);??????????? break;??????????? case"*":??????????? result=parseInt(num1)*parseInt(num2);??????????? break;??????????? case"/":??????????? result=parseInt(num1)/parseInt(num2);??????????? break;??????????? default:??????????? result=null;??????????? }??????????? document.getElementById("num3") = result;??????? }</script>><title>計(jì)算器簡(jiǎn)單功能實(shí)現(xiàn)</title></head><body><input type="text" name="num" id="num1"><select id="symble"><option>+</option><option>-</option><option selected="selected">*</option><option>/</option></select><input type="text" name="num" id="num2"><input type="button" value="=" onclick = "count()"><input type="text" name="num" id="num3"></body></html>
求大神指導(dǎo)下哦 點(diǎn)擊“=”沒有反應(yīng)呢？
慕容6447874
2018-07-15 12:54:34
