求解為什么點(diǎn)=沒(méi)有反應(yīng)
<!DOCTYPE html>
<html>
?<head>
? <title> 事件</title> ?
? <script type="text/javascript">
?? function count(){
??? var? lya1=document.getElementById("txt1").value;
???? var lya2=document.getElementById("txt2").value;
???? var wzei=document.getElementById("select").value;
???? var rintur="";
?? ?
??? switch(wzei)
??? {
????? case "+":
????? rintur= parseFloat(lya1)+ parseFloat(lya2);
?????? break;
????? case "-":
????? rintur= parseFloat(lya1)-parseFloat(lya2);
????? break;
????? case "*":
????? rintur = parseFloat(lya1)* parseFloat(lya2);
????? break;
???? default:
????? rintur = parseFloat(lay1)/ parseFloat(lya2);
????? break;
?? }
???? document.getElementById("fruit").value=rintur;
?? }
? </script>
?</head>
?<body>
?? <input type='text' id='txt1' />
?? <select id='select'>
?? ??? ?<option value='+'>+</option>
?? ??? ?<option value="-">-</option>
?? ??? ?<option value="*">*</option>
?? ??? ?<option value="/">/</option>
?? </select>
?? <input type='text' id='txt2' />
?? <input type='button' value=' = ' onclick=count/> <!--通過(guò) = 按鈕來(lái)調(diào)用創(chuàng)建的函數(shù)，得到結(jié)果-->
?? <input type='text' id='fruit' />? ?
?</body>
</html>
2018-12-17
2018-12-26
事件調(diào)用函數(shù)應(yīng)該是onclick="count()",你的是count/
2018-12-18
因?yàn)槟愠ǖ淖侄握{(diào)用錯(cuò)了,你沒(méi)發(fā)現(xiàn),你除法傳過(guò)來(lái)的字段是lay1嗎?
你上面定義的變量是lya1