為啥執(zhí)行不了？
<!DOCTYPE html>
<html>
?<head>
? <title> 事件</title>?
? <script type="text/javascript">
?? function count(){
??? //獲取第一個(gè)輸入框的值
??? var oTxt1 = document.getElementById("txt1").value;
?//獲取第二個(gè)輸入框的值
?var oTxt2 = document.getElementById("txt2").value;
?//獲取選擇框的值
?var oSIt = document.getElementById("select").value;
?//獲取通過(guò)下拉框來(lái)選擇的值來(lái)改變加減乘除的運(yùn)算法則
? var result="";
?switch(oSIt){
???? case "+":
???????? result = parseInt(oTxt1) + parseInt(oTxt2);
???????? break;
???? case "-":
???????? result = parseInt(oTxt1) - parseInt(oTxt2);
???????? break;
???? case "*":
???????? result = parseInt(oTxt1) * parseInt(oTxt2);
???????? break;
???? case "/":
??????? result = parseInt(oTxt1) / parseInt(oTxt2);
??? //設(shè)置結(jié)果輸入框的值
??? document.getElementById("fruit").vlaue = result;
?? }
? </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>
2018-03-13
//應(yīng)該是這樣
}?
//設(shè)置結(jié)果輸入框的值?
??? document.getElementById("fruit").value = result;
?? }
2018-03-13
? //設(shè)置結(jié)果輸入框的值?
??? document.getElementById("fruit").vlaue = result;
?? }
這句漏了"}"號(hào),而且value打錯(cuò)了
2018-03-13
<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-->?
這句漏了引號(hào)，應(yīng)改為：<input type='button' value=' = ' onclick="count()" />