隐藏撤回意见

```
var workLog = this.target.workLog;
var taskCompletedMap = {};
workLog.forEach(function(log) {
if (log.taskCompleted !== undefined) {
taskCompletedMap[log.taskCompleted] = log;
}
});
workLog.forEach(function(log) {
if (log.type === "retract" && log.retractTaskCompleted !== undefined) {
var relatedLog = taskCompletedMap[log.retractTaskCompleted];
if (relatedLog) {
relatedLog.opinion = "";
if (relatedLog.properties) {
relatedLog.properties.opinion = "";
} else {
relatedLog.properties = { opinion: "" };
}
}
}
});
```