selectedRows丢失，解决办法

    1. onSelectChange(selectedRowKeys, selectedRows) {
    2.       this.selectedRowKeys = selectedRowKeys
    3.       this.selectedRows = selectedRows
    4.       if (this.selectedData.length > 0) {
    5.         this.selectedData = this.MergeArray(this.selectedData, selectedRows)
    6.       } else {
    7.         this.selectedData = selectedRows
    8.       }
    9.     },
    10.     // 去重
    11.     MergeArray(arr1, arr2) {
    12.       var _arr = []
    13.       for (var i = 0; i < arr1.length; i++) {
    14.         _arr.push(arr1[i])
    15.       }
    16.       for (var x = 0; x < arr2.length; x++) {
    17.         var flag = true
    18.         for (var j = 0; j < arr1.length; j++) {
    19.           if (arr2[x].id+arr2[x].postSignatureId === arr1[j].id+arr1[j].postSignatureId) {
    20.             flag = false
    21.             break
    22.           }
    23.         }
    24.         if (flag) {
    25.           _arr.push(arr2[x])
    26.         }
    27.       }
    28.       _arr = this.spliceArray(_arr, this.selectedRowKeys)
    29.       return _arr
    30.     },
    31.     // 删除未选择数据
    32.     spliceArray(arr1, arr2) {
    33.       var _arr = []
    34.       for (var x = 0; x < arr1.length; x++) {
    35.         for (var j = 0; j < arr2.length; j++) {
    36.           if (arr1[x].id+arr1[x].postSignatureId === arr2[j]) {
    37.             _arr.push(arr1[x])
    38.           }
    39.         }
    40.       }
    41.       return _arr
    42.     },

    this.selectedData 就会是需要的