<!DOCTYPE html><html> <head> <title> 事件</title> <script type="text/javascript"> function count(){ var txt1 = document.getElementById("txt1").value; var txt2 = document.getElementById("txt2").value; var c= document.getElementById("select").value; var result = ""; switch(c) { case "+": result = parseInt(txt1) + parseInt(txt2); break; case "-": result = parseInt(txt1) - parseInt(txt2); break; case "*": result = parseInt(txt1) * parseInt(txt2); break; default: result = parseInt(txt1) / parseInt(txt2); } document.getElementById("fruit").value = 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();' /> <!--通过 = 按钮来调用创建的函数，得到结果--> <input type='text' id='fruit'/> </body></html>
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