deepCopy(o1, o2) { // 将o2的内容拷贝给data中的o1
   var key, i
   if (o2 instanceof Array) {
    for (i = 0; i < o2.length; i++) {
     if (o2[i] instanceof Array) {
      this.$set(o1, i, [])
      this.deepCopy(o1[i], o2[i])
     }
     else if (o2[i] instanceof Object) {
      this.$set(o1, i, {})
      this.deepCopy(o1[i], o2[i])
     }
     else {
      this.$set(o1, i, o2[i])
     }
    }
   }
   else if (o2 instanceof Object) {
    for (key in o2) {
     if (o2[key] instanceof Array) {
      this.$set(o1, key, [])
      this.deepCopy(o1[key], o2[key])
     }
     else if (o2[key] instanceof Object) {
      this.$set(o1, key, {})
      this.deepCopy(o1[key], o2[key])
     }
     else {
      this.$set(o1, key, o2[key])
     }
    }
   }
   else {
    o1 = o2
   }
}