1.背景

一段json非常长，且结构复杂，怎么快速获取嵌套结构

2.方法

使用vscode的折叠功能，配合前端界面的图片内容提示，删除冗余的内容（list中的内容只保留第一个），这样便可以缩短json，只保留基础结构

1st.Ctrl + k + (0,1,2,3)进行结构折叠

使用vscode的Ctrl + k + (0,1,2,3)进行结构折叠，数字代表折叠的层级。

2nd.删除列表中冗余元素

根据前端界面可知大家电和电视分别是不同层级列表的第一个元素,每个层级的列表仅保留第一个元素

删除冗余元素之后，json字符串变得比较短，结构也清晰可见

{"message": [{"cat_id": 1,"cat_name": "大家电","cat_pid": 0,"cat_level": 0,"cat_deleted": false,"cat_icon": "/full/none.jpg","children": [{"cat_id": 3,"cat_name": "电视","cat_pid": 1,"cat_level": 1,"cat_deleted": false,"cat_icon": "/full/none.jpg","children": [{"cat_id": 5,"cat_name": "曲面电视","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/2fb113b32f7a2b161f5ee4096c319afedc3fd5a1.jpg"}]}]}        ],"meta": {"msg": "获取成功","status": 200}
}

附.原始的json字符串

{"message": [{"cat_id": 1,"cat_name": "大家电","cat_pid": 0,"cat_level": 0,"cat_deleted": false,"cat_icon": "/full/none.jpg","children": [{"cat_id": 3,"cat_name": "电视","cat_pid": 1,"cat_level": 1,"cat_deleted": false,"cat_icon": "/full/none.jpg","children": [{"cat_id": 5,"cat_name": "曲面电视","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/2fb113b32f7a2b161f5ee4096c319afedc3fd5a1.jpg"},{"cat_id": 6,"cat_name": "海信","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/5e38cf9e6e7c46a17fe1c597a883ae627977b296.jpg"},{"cat_id": 8,"cat_name": "夏普","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/cece39bd7e9654c20043e4af71696e1f838d4a22.jpg"},{"cat_id": 9,"cat_name": "创维","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/f62eba98423af3311487f3331c6798d8f099c893.jpg"},{"cat_id": 10,"cat_name": "TCL","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/86832cc37db8474ac07853c835009f9873eaec89.jpg"},{"cat_id": 11,"cat_name": "PPTV","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/41c169f14680b3ebf88b4a37ea09085ed731c985.jpg"},{"cat_id": 12,"cat_name": "小米","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/5c282c3ec283fbc092107f8c7b86f212365acdfa.jpg"},{"cat_id": 13,"cat_name": "长虹","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/14291787e1f9f0215816048e813e4ec4fbb3dffe.jpg"},{"cat_id": 14,"cat_name": "康佳","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/de58455691bc7b85351055c220f1a5410ab15693.jpg"},{"cat_id": 15,"cat_name": "三星","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/8b36730c09815e90de1f86664baef8690c89e979.jpg"},{"cat_id": 16,"cat_name": "飞利浦","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/7643c31541df41da21c9e734bd2d9a18fed2a2aa.jpg"},{"cat_id": 17,"cat_name": "索尼","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/e8c76dd2bb103a620929bcb4ad5c5431d62418d3.jpg"},{"cat_id": 18,"cat_name": "先锋","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/5a46bef92bf32f0157b4d5a6d9a35ca8a5615aca.jpg"},{"cat_id": 19,"cat_name": "家庭影院","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/5fae60f2cc05c53eaf43075db7eb82bfc9bba9b4.jpg"},{"cat_id": 20,"cat_name": "音响","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/5515d491f88587084e59aac50010458bb916ee17.jpg"},{"cat_id": 21,"cat_name": "盒子","cat_pid": 3,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/e65bab9fcb64c336a3f5fba3b2174fef41f12330.jpg"}]},{"cat_id": 7,"cat_name": "空调","cat_pid": 1,"cat_level": 1,"cat_deleted": false,"cat_icon": "/full/none.jpg","children": [{"cat_id": 23,"cat_name": "变频空调","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/994977fac8f4fa6cea5eb413cd64ddac24a97600.jpg"},{"cat_id": 24,"cat_name": "立柜空调","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/19fc040b41b4c821c16748529545265f5feb34fa.jpg"},{"cat_id": 25,"cat_name": "挂壁空调","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/7f3dfec1efdb2559d7fba1ea39d901f4763fae21.jpg"},{"cat_id": 26,"cat_name": "中央空调","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/47a417ea3c71e5b88a261729e43706611da4ae7e.jpg"},{"cat_id": 27,"cat_name": "移动空调","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/b9f06f11815deebf5417636cf6967d859956e8bf.jpg"},{"cat_id": 28,"cat_name": "海尔","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/528517c1f5c49a15f4558be03f46e27f23d379ba.jpg"},{"cat_id": 29,"cat_name": "三菱重工","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/3ae5b4e47f663b3889edc694c95bf098b7893316.jpg"},{"cat_id": 31,"cat_name": "志高","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/4d5fd81e6e2e45a9a55d187c2326dea57ef90f9d.jpg"},{"cat_id": 32,"cat_name": "奥克斯","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/9ec815cf683ef384f74c0b1c6011891da20589f9.jpg"},{"cat_id": 33,"cat_name": "长虹","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/74547903a7193d252f4a1643849cc707981affa2.jpg"},{"cat_id": 34,"cat_name": "科龙","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/85ac1aecafb4f25158d2e08d213e6f617307a323.jpg"},{"cat_id": 35,"cat_name": "海信","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/2079cb1725672419834c3624d52b6abaea8be308.jpg"},{"cat_id": 36,"cat_name": "惠而浦","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/33774cdd0a4b866bc3f56c0fc55a0063d1f15892.jpg"},{"cat_id": 37,"cat_name": "空调清洗","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/f4836d9ba4831e4d81ab275cff4ab50677076a2b.jpg"},{"cat_id": 38,"cat_name": "空调维修","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/19ed844b023720a49792de3c1397e614c9bb260b.jpg"},{"cat_id": 39,"cat_name": "空调安装","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/f216557789c6d87ac6b31845e0a8c47186d6521a.jpg"},{"cat_id": 40,"cat_name": "空调回收","cat_pid": 7,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/da07de0ac2f01b18a9ec206fd44a51cf117cf987.jpg"}]},{"cat_id": 30,"cat_name": "洗衣机","cat_pid": 1,"cat_level": 1,"cat_deleted": false,"cat_icon": "/full/none.jpg","children": [{"cat_id": 42,"cat_name": "洗衣机","cat_pid": 30,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/d33bc76faf761d86692f6b79dbd5bdb007a6c060.jpg"},{"cat_id": 43,"cat_name": "滚筒洗衣机","cat_pid": 30,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/4f083927b8062beb2e2a8e5fbcb956e07231e644.jpg"},{"cat_id": 44,"cat_name": "波轮洗衣机","cat_pid": 30,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/2333a004401004514d43fc56bf3a08de3d6dee44.jpg"},{"cat_id": 45,"cat_name": "大容量洗衣机","cat_pid": 30,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/e2459762678fe83b75b10dab705d9be2570d014c.jpg"},{"cat_id": 46,"cat_name": "迷你洗衣机","cat_pid": 30,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/1fa57f855d15370a93c16c12b856fae164458c5b.jpg"},{"cat_id": 47,"cat_name": "双缸洗衣机","cat_pid": 30,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/d8549a361e957132f07d7a9ebcee9bcf9adc12a1.jpg"},{"cat_id": 48,"cat_name": "干衣机","cat_pid": 30,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/259207618f9cb1fda1fcb8f4ce16280bde8959de.jpg"},{"cat_id": 49,"cat_name": "洗衣机服务","cat_pid": 30,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/ac69da199d085a7c59360686310697565ef8083e.jpg"},{"cat_id": 50,"cat_name": "西门子","cat_pid": 30,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/b7c7741303e60a58bbc5ea6ad6679cd0c7f08ce7.jpg"},{"cat_id": 51,"cat_name": "海尔","cat_pid": 30,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/d2a002e5912a0cf8e74352a9ea38e17e165ccc8d.jpg"},{"cat_id": 52,"cat_name": "小天鹅","cat_pid": 30,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/3732a28271acaadbdedefb7445efae3aac1c3c81.jpg"}]},{"cat_id": 53,"cat_name": "冰箱","cat_pid": 1,"cat_level": 1,"cat_deleted": false,"cat_icon": "/full/none.jpg","children": [{"cat_id": 57,"cat_name": "对开门冰箱","cat_pid": 53,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/4b6bfa1646ca0beeb0acda07f77149bc1e3e7185.jpg"},{"cat_id": 58,"cat_name": "多门冰箱","cat_pid": 53,"cat_level": 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"https://api-hmugo-web.itheima.net/full/53f4290298db81aed79bd8b4cc97c019da49eb1b.jpg"},{"cat_id": 64,"cat_name": "海尔","cat_pid": 53,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/d2a002e5912a0cf8e74352a9ea38e17e165ccc8d.jpg"},{"cat_id": 65,"cat_name": "西门子","cat_pid": 53,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/b7c7741303e60a58bbc5ea6ad6679cd0c7f08ce7.jpg"},{"cat_id": 66,"cat_name": "容声","cat_pid": 53,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/722b97ed263f975f3dc25e8ac94084c79cd44962.jpg"},{"cat_id": 67,"cat_name": "美菱","cat_pid": 53,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/e55f3b4c84ebe797397537e2d92e4fd31482d398.jpg"}]}]},{"cat_id": 55,"cat_name": "热门推荐","cat_pid": 0,"cat_level": 0,"cat_deleted": false,"cat_icon": "/full/none.jpg","children": [{"cat_id": 69,"cat_name": "圣诞狂欢","cat_pid": 55,"cat_level": 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"平板电脑","cat_pid": 69,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/d2a821ebd29bad4bf687dc84cc6e092a1792c66f.jpg"},{"cat_id": 78,"cat_name": "笔记本","cat_pid": 69,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/fd85e32427cfb12e312e4a1022898b3aa3321822.jpg"},{"cat_id": 79,"cat_name": "苹果手机","cat_pid": 69,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/b4033ffe4dca02026431fe654aa929304defbc2e.jpg"},{"cat_id": 80,"cat_name": "小米手机","cat_pid": 69,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/b0fef388cd035694eac75d7b53e4a1eebf041cf3.jpg"},{"cat_id": 81,"cat_name": "数码相机","cat_pid": 69,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/8bd047f8eed61c47305dff3373890a7ef33e785f.jpg"},{"cat_id": 82,"cat_name": "耳机耳麦","cat_pid": 69,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/cec82af42e24d626d82017f1698a3497038e9ebf.jpg"},{"cat_id": 83,"cat_name": "挂机空调","cat_pid": 69,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/4b6f5f2964874da6851c1d96bcefaf3840c96d01.jpg"},{"cat_id": 84,"cat_name": "空气净化器","cat_pid": 69,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/c28dbf9b72eeaf7150c5a2bade7dc35873db6e8e.jpg"},{"cat_id": 85,"cat_name": "洗衣机","cat_pid": 69,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/5027b6e3f593d4625001644b419a24fffeb68191.jpg"},{"cat_id": 86,"cat_name": "4K超高清","cat_pid": 69,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/fd99414907afb2e0382456b55ae051e51f9816f5.jpg"},{"cat_id": 87,"cat_name": "洗碗机","cat_pid": 69,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/23001b342737d8952e135bdaf2eaa0a8a71c2fd5.jpg"}]},{"cat_id": 1007,"cat_name": "冲锋衣","cat_pid": 55,"cat_level": 2,"cat_deleted": false,"cat_icon": "https://api-hmugo-web.itheima.net/full/dec71b02fc79cd5c3cf2f596f5fc40f2ae90ba15.jpg"}]}],"meta": {"msg": "获取成功","status": 200}
}

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