小程序可以动态渲染数据吗

我想动态渲染以上数据 ，先采用随机方式取一个数字，然后加到正确的数字 ，采用这样的动态方式

rollData: function(realData, index = 0){     let roundData, randomData;     if(index == 0) {       roundData = [1, 2, 3, 4, 5, 6, 7, 8, 9];       roundData.splice(roundData.find((item, index) => {         if (item === realData[index]) {           return index;         }       }), 1)       randomData = roundData[Math.floor(Math.random() * 9)];     }     else {       roundData = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];       roundData.splice(roundData.find((item, index) => {         if (item === realData[index]) {           return index;         }       }), 1)       randomData = roundData[Math.floor(Math.random() * 10)];     }     this.rollFunc(randomData, realData, roundData, index)   },   rollFunc: function(randomData, realData, roundData, index) {     let arrData = `letter[${index}]`;     console.log(randomData, realData, roundData, index)     this.setData({       [arrData]: randomData     })     if(randomData == realData[index]) {       if(++index === (realData.length-1)) {         console.log(33333)         return;       }else {         this.rollData(realData, index)       }     }     if(++randomData > 9 ){       if(index === 0) {         randomData = 1       } else {         randomData = 0       }     }     this.rollFunc(randomData, realData,roundData,index)   },

以上为自定义方法

this.rollData([1,2,3,4])

我在onload调用方法时，发现小程序并没有动态渲染

想问一下怎么实现这个功能呢  万分感谢(´▽`ʃ♡ƪ)