IT common sense常识

1. how to input formative json data in console

console.log({"message": [{"cat_id": 1,"cat_name": "大家电","cat_pid": 0,"cat_level": 0,"cat_deleted": false,,,,})

2) how to clear unecessary content on Browser console

clear();

3. At browser console, how to jump to another line without terminate the code;
   press Shift & Enter altogether at the same time;