递归，闭包，变量，死循环（心态炸了......）

 1 handleItemChange(val) {
 2       console.log(val, '----')
 3       console.log(this.defaultOptions, '二二二')
 4       var code = val[val.length - 1]
 5 
 6       var level = this.getlevel(code, this.defaultOptions) //递归执行函数
 7       console.log(level, '递归查出来的level')
 8 
 9       this.defaultOptions = this.handleData(this.defaultOptions, code, level)
10     },
11     //递归查divlevel
12     getlevel(code, defaultOptions) {
13       console.log(code, defaultOptions, '555555')
14       let divLevel = ''
15       defaultOptions.forEach(item => {
16         if (item.divCode === code) {
17           divLevel = item.divLevel
18         } else {
19           let tmp = this.getlevel(code, item.children)
20           if (tmp && tmp.length != 0) {
21             divLevel = tmp
22             return tmp
23           }
24         }
25       })
26       return divLevel
27     }