/** index.js*/
var app = getApp()  
Page({  
    data: {  
        /**   
         * 页面配置  
         */  
        winWidth: 0,  
        winHeight: 0,  
        // tab切换    
        currentTab: 0, 
                option1:[
          {value:"1",contant:"A:xxxx"},
          {value:"2",contant:"B:xxxx"},
          {value:"3",contant:"C:xxxx"},
          {value:"4",contant:"D:xxxx"}
        ],
        option2: [
          { value: "1", contant: "A:xxxx" },
          { value: "2", contant: "B:xxxx" },
          { value: "3", contant: "C:xxxx" },
          { value: "4", contant: "D:xxxx" }
        ], 
        option3: [
          { value: "1", contant: "A:xxxx" },
          { value: "2", contant: "B:xxxx" },
          { value: "3", contant: "C:xxxx" },
          { value: "4", contant: "D:xxxx" }
        ],
        option1Value:0,
        option2Value:0,
        option3Value:0,
    },  
    onLoad: function() {   swiperChange: function(e){
                var that = this;
        if(that.data.currentTab==0){
          that.setData({
            option1Value : e.detail.value,
            currentTab: 1 
          });
        }else if(that.data.currentTab==1){
          that.setData({
            option2Value : e.detail.value,
            currentTab: 2
          });
        }else if(that.data.currentTab==2){
          that.setData({
            option3Value : e.detail.value,
            currentTab: 3
          })
        } 
         }   


})  


                    
    
    第一题    
    第二题    
    第三题      


                    
    

                        
        
      
        
          {{item.contant}}
        
         
        

                        
        
      
        
          {{item.contant}}
        
         
      

                        
        
      
        
          {{item.contant}}
        
         
     

         
        {{score}}
    

以上是我的代码，想实现页面中有三个题目，分别有四个不同分值的选项，用户选择后直接弹出结果，但是储存用户选择的选项的JSON数据是字符串，请问如何转换为数字类型？