修复知识付费编辑考试计算精度问题

问题描述：

编辑考试时计算精度问题。

解决方法：

1、下载 big.js（见附件） 并放入 public/static/plug 目录下。

2、application/admin/view/public/style.php，添加下面代码。

3、application/admin/view/questions/test_paper/add.php，添加下面代码。

computed: {
                sum: function () {
                  var singleNumber = new Big(this.formData.single_number || '0');
                  var manyNumber = new Big(this.formData.many_number || '0');
                  var judgeNumber = new Big(this.formData.judge_number || '0');
                  return singleNumber.plus(manyNumber).plus(judgeNumber);
                },
                total: function () {
                  var singleNumber = new Big(this.formData.single_number || '0');
                  var singleScore = new Big(this.formData.single_score || '0');
                  var manyNumber = new Big(this.formData.many_number || '0');
                  var manyScore = new Big(this.formData.many_score || '0');
                  var judgeNumber = new Big(this.formData.judge_number || '0');
                  var judgeScore = new Big(this.formData.judge_score || '0');
                  return singleNumber.times(singleScore).plus(manyNumber.times(manyScore)).plus(judgeNumber.times(judgeScore));
                }
            },

4、清除缓存。