有沒(méi)有大神看看咋出錯(cuò)了呀
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慕設(shè)計(jì)7486192
2021-07-30
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2022-07-14
哥，你的詞打錯(cuò)了，應(yīng)該是“parseInt”，這里面的“I”大寫(xiě)。。
2021-08-26
a、b要從字符串轉(zhuǎn)換為數(shù)值才能進(jìn)行數(shù)值運(yùn)算，例：
b.value=praseInt(a)+praseInt(b);
完整代碼：
<!DOCTYPE?html>
<html>
?<head>
??<title>?事件</title>??
??<script?type="text/javascript">
???function?count(){
???????var?num1=document.getElementById("txt1").value;
???????var?num2=document.getElementById("txt2").value;
???????var?opera=document.getElementById("select").value;
???????var?summ=document.getElementById("fruit");
???????switch(opera)
???????{
???????????case?"+":{
???????????????summ.value=parseInt(num1)+parseInt(num2);
???????????};break;
???????????case?"-":{
??????????????summ.value=parseInt(num1)-parseInt(num2);
???????????};break;
???????????case?"*":{
???????????????summ.value=parseInt(num1)*parseInt(num2);
???????????};break;
???????????case?"/":{
???????????????summ.value=parseInt(num1)/parseInt(num2);
???????????};break;
???????}
????//獲取第一個(gè)輸入框的值
?//獲取第二個(gè)輸入框的值
?//獲取選擇框的值
?//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
????//設(shè)置結(jié)果輸入框的值?
????
???}
??</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>
2021-08-06
將字符串轉(zhuǎn)為整數(shù)???? parseInt(document.getElementById("txt1").value)
document.getELement("fruit")? ?"加引號(hào)"