慕虎1979451
2016-10-16 13:35
<!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 firstNumber=document.getElementById("txt1").value; //获取第二个输入框的值 var sencondNumber=document.getElementById("txt2").value; //获取选择框的值 var selectValue=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 sum=""; switch(seletValue){ case"+": sum=parseInt(firstNumber)+parseInt(secondNumber); break; case"-": sum=parseInt(firstNumber)-parseInt(secondNumber); break; case"*": sum=parseInt(firstNumber)*parseInt(secondNumber); break; default: sum=parseInt(firstNumber)/parseInt(secondNumber); break; }; //设置结果输入框的值 document.getElementById("fruit").value=sum; } </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>
<!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 select=document.getElementById("select").value; var resule; switch(select) { case "+":resule=parseInt(txt1)+parseInt(txt2);break; case "-":resule=parseInt(txt1)-parseInt(txt2);break; case "*":resule=parseInt(txt1)*parseInt(txt2);break; case "/":resule=parseInt(txt1)/parseInt(txt2);break; } document.getElementById("fruit")=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>
var firstNumber=document.getElementById("txt1").value;
//获取第二个输入框的值
var sencondNumber=document.getElementById("txt2").value;
//获取选择框的值
var selectValue=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 sum="";
switch(seletValue){
case"+":
sum=parseInt(firstNumber)+parseInt(secondNumber);
break;
case"-":
sum=parseInt(firstNumber)-parseInt(secondNumber);
break;
case"*":
sum=parseInt(firstNumber)*parseInt(secondNumber);
break;
case"/":
sum=parseInt(firstNumber)/parseInt(secondNumber);
break;
};
//设置结果输入框的值
document.getElementById("fruit").value=sum;
}
JavaScript进阶篇
468061 学习 · 21891 问题
相似问题
回答 1
回答 1