原数据：

 list:[
  {
     child:[],
     code: null,
     desc: null,
     id: "4028812c72d57fa30172d593f8400002",
     info:"{\"SUCCESSALL\":3,\"FAILURE5393896bd36e4b708c069d4e1bb7c8b1\":0,\"FAILUREALL\":0,\"SUCCESS5393896bd36e4b708c069d4e1bb7c8b1\":1,\"FAILURE7a775cebd5c64c789beb9012bebfad33\":0,\"SUCCESS7a775cebd5c64c789beb9012bebfad33\":2}",
      parentId: ""
   }, {
     child: [],
     code: null,
     desc: null,
     id: "4028812c72d57fa30172d593f8400002",
     info:"{\"SUCCESSALL\":1,\"FAILURE5393896bd36e4b708c069d4e1bb7c8b1\":0,\"FAILUREALL\":0,\"SUCCESS5393896bd36e4b708c069d4e1bb7c8b1\":0,\"FAILURE7a775cebd5c64c789beb9012bebfad33\":0,\"SUCCESS7a775cebd5c64c789beb9012bebfad33\":1}",
     name: "2号楼",
     parentId: ""
   }
 ]

结果：

 list:[
 {
    SUCCESSALL: 0,
    FAILURE7a775cebd5c64c789beb9012bebfad33: 2,
    FAILURE5393896bd36e4b708c069d4e1bb7c8b1: 1,
    FAILUREALL: 3,
    SUCCESS7a775cebd5c64c789beb9012bebfad33: 0,
    SUCCESS5393896bd36e4b708c069d4e1bb7c8b1: 0,
    child: [],
    code: null,
    desc: null,
    id: "4028812c72d57fa30172d593f8400002",
    info:"{\"SUCCESSALL\":1,\"FAILURE5393896bd36e4b708c069d4e1bb7c8b1\":0,\"FAILUREALL\":0,\"SUCCESS5393896bd36e4b708c069d4e1bb7c8b1\":0,\"FAILURE7a775cebd5c64c789beb9012bebfad33\":0,\"SUCCESS7a775cebd5c64c789beb9012bebfad33\":1}",
    name: "2号楼",
    parentId: ""
  }
]

实现方法：

for (var i = 0; i < data.length; i++) {
    var info = eval("(" + data[i].info + ")");
    console.log(info);
    Object.assign(data[i], info);
 }