<!DOCTYPE html> <html> <head> <title> 事件</title> <script type="text/javascript"> function count(){ //获取第一个输入框的值 var txt1 = document.getElementById("txt1").value; //获取第二个输入框的值 var txt2 = document.getElementById("txt2").value; //获取选择框的值 var select = document.getElementById("select").value; //获取通过下拉框来选择的值来改变加减乘除的运算法则 var my = " "; //设置结果输入框的值 switch(select){ case "+": my=txt1+txt2; break; case "-": my=txt1-txt2; break; case "*": my=txt1*txt2; break; case "/": my=txt1/txt2; break; } document.getElementById("fruit").value=my; } </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>
Perona
cyper
相关分类