<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(){
var va1 = document.getElementById("txt1");
var va2 = document.getElementById("txt2");
var text1 = parseInt(va1.value);
var text2 = parseInt(va2.value);
var select = document.getElementById("select").value;
var add = "";
switch(select){
case "+":
add = text1 + text2 ;
break;
case "-":
add = text1 - text2;
break;
case "*":
add = text1 * text2;
break;
case "/":
add = text1 / text2;
break;
}
document.getElementById("fruit").value = add;
}
</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=' = ' /> <!--通过 = 按钮来调用创建的函数,得到结果-->
<input type='text' id='fruit' />
</body>
</html>
没有绑定事件onclick
大兄弟,你的按钮没有设置onclick事件啊,帮你修改了一下,如下:
<!DOCTYPE html> <html> <head> <title> 事件</title> <script type="text/javascript"> function count(){ var va1 = document.getElementById("txt1"); var va2 = document.getElementById("txt2"); var text1 = parseInt(va1.value); var text2 = parseInt(va2.value); var select = document.getElementById("select").value; var add = 0; switch(select){ case "+": add = text1 + text2 ; break; case "-": add = text1 - text2; break; case "*": add = text1 * text2; break; case "/": add = text1 / text2; break; } document.getElementById("fruit").value = add; } </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()" /> <!--通过 = 按钮来调用创建的函数,得到结果--> <input type='text' id='fruit' /> </body> </html>
谢谢采纳!