Question

朋友们，我有两个变量price1＆amp;价格2，我正在使用onchange事件动态获取价格值现在我想添加这两个变量。

//get support layer firmness price
$('.support-layer-firmness').on('change', function(e) {
      //first price
  var price1 = 300;
  });



 $('.support-layer-thickness').on('change', function(e) {
  //second price
  var price2 = 200;

 });


 Now I want to add both variables price1 & price2
eg price = price1+price2;
 o/p  price= 500;

我怎样才能实现这一目标..

Answer 1

将变量设为global并在各个更改事件中设置值，然后您可以将值添加到任何位置。

$(document).ready(function(){

var price1=0;
var price2=0;

$('.support-layer-firmness').on('change', function(e) {
      //first price
   price1 = 300;
});



 $('.support-layer-thickness').on('change', function(e) {
  //second price
  price2 = 200;
  alert(price1 + price2); //add price
 });

//or you can calculate them on button click 
 $('#btnAdd').click(function(){
   alert(price1 + price2);
  });

});

Answer 2

你需要为这两个函数定义全局变量，比如

    var price=0,price1=0,price2=0;
//get support layer firmness price
$('.support-layer-firmness').on('change', function(e) {
      //first price
       price1 = 300;
       price=price1+price2;
       alert(price);
  });



 $('.support-layer-thickness').on('change', function(e) {
  //second price
  price2 = 200;
  price=price1+price2;
  alert(price);
 });

Answer 3

从外面访问变量。您必须在事件句柄之外声明变量（price1＆amp; price2）。

var price1,price2; //<= declare here
//get support layer firmness price
$('.support-layer-firmness').on('change', function(e) {
      //first price
  price1 = 300;
  });



 $('.support-layer-thickness').on('change', function(e) {
  //second price
  price2 = 200;

 });

http://www.w3schools.com/js/js_scope.asp

使用jquery添加两个变量

3 个答案: