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Posted on

https://stackoverflow.com/questions/17964757/how-to-prune-delete-nodes-in-nested-tree-like-json

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var a =  [
    {
        "label": "node1",
        "children": [
            {
                "label": "Human"
            },
            {
                "label": "Chimpanzee"
            }
        ]
    },
    {
        "label": "node2",
        "children": [
            {
                "label": "node3",
                "children": [
                    {
                        "label": "Rat"
                    },
                    {
                        "label": "Mouse"
                    }
                ]
            },
            {
                "label": "BigRat"
            }
        ]
    }
]

function prune(array, label) {
    for (var i = 0; i < array.length; ++i) {
        var obj = array[i];
        if (obj.label === label) {
            // splice out 1 element starting at position i
            array.splice(i, 1);
            return true;
        }
        if (obj.children) {
            if (prune(obj.children, label)) {
                if (obj.children.length === 0) {
                    // delete children property when empty
                    delete obj.children;

                    // or, to delete this parent altogether
                    // as a result of it having no more children
                    // do this instead
                    array.splice(i, 1);
                }
                return true;
            }
        }
    }
}

var wasItPruned = prune(tree, "node3");

Posted on

简单说，就是允许碰撞

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"icon-ignore-placement": true, //  不管下面
"icon-allow-overlap": true, // 允许被覆盖

"text-ignore-placement": true,
"text-allow-overlap": true,

polygon 多维数组是 “挖洞”

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var aa =  { "type": "Polygon",
  "coordinates": [
    
    [ [108.9093384209429, 34.25000258545077],[108.90846464854332, 34.24677914297165],[108.91640950499936, 34.24612373914805],[108.91687875313949, 34.249801959853556],[108.9093384209429, 34.25000258545077]],

    [ [108.91183029038228, 34.24663201194514] ,[108.91448396952353, 34.24651163182365], [108.91482376990217, 34.247608422127456],[108.91183029038228, 34.24663201194514]],

    [[108.91026413410287, 34.24909755966851],[108.90994051469443, 34.24858930176197],[108.9122058505489, 34.248442173900116],[108.91243238413387, 34.24909755966851]]

  ]
}

test.map.getSource('temp_polygon').setData(aa)

MultiPolygon

最外面多一层

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var aa =  { "type": "MultiPolygon",
  "coordinates": [[
    
    [ [108.9093384209429, 34.25000258545077],[108.90846464854332, 34.24677914297165],[108.91640950499936, 34.24612373914805],[108.91687875313949, 34.249801959853556],[108.9093384209429, 34.25000258545077]],

    [ [108.91183029038228, 34.24663201194514] ,[108.91448396952353, 34.24651163182365], [108.91482376990217, 34.247608422127456],[108.91183029038228, 34.24663201194514]],


  [[108.91026413410287, 34.24909755966851],[108.90994051469443, 34.24858930176197],[108.9122058505489, 34.248442173900116],[108.91243238413387, 34.24909755966851]]

  ]]
}

test.map.getSource(‘temp_polygon’).setData(aa)

多个 polygon

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var aa = {
  "type": "MultiPolygon",
  "coordinates": [
    [

      [[108.9093384209429, 34.25000258545077], [108.90846464854332, 34.24677914297165], [108.91640950499936, 34.24612373914805], [108.91687875313949, 34.249801959853556], [108.9093384209429, 34.25000258545077]],
    ],
    [
      [[108.91183029038228, 34.24663201194514], [108.91448396952353, 34.24651163182365], [108.91482376990217, 34.247608422127456], [108.91183029038228, 34.24663201194514]],
    ],
    [
      [[108.91026413410287, 34.24909755966851], [108.90994051469443, 34.24858930176197], [108.9122058505489, 34.248442173900116], [108.91243238413387, 34.24909755966851]]
    ]
  ],
}

test.map.getSource('temp_polygon').setData(aa)

（从世界中）只显示 xxx

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var aa =  {
  "type": "Polygon",
  "coordinates": [
    [[-180, -90], [-180, 90], [180, 90], [180, -90], [-180, -90]],

    要删掉的部分

    
  ]
}

test.map.getSource('temp_polygon').setData(aa)

Posted on

最大化

option(alt) 点击左上角绿色按钮 最大化（不是全屏）

全屏

ctrl+command+f

Posted on 
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var clone = Object.assign({}, {a: 1, b: 2, c: 3});
delete clone.b;

这个不完美

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var clone2 = Object.assign({}, {a: 1, b: 2, c: 3}, {b: undefined});
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const x = {a: 1, b: 2, c: 3, z:26};

const objectWithoutKey = (object, key) => {
  const {[key]: deletedKey, ...otherKeys} = object;
  return otherKeys;
}

console.log(objectWithoutKey(x, 'b')); // {a: 1, c: 3, z:26}
console.log(x); // {a: 1, b: 2, c: 3, z:26};
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const obj = { a: 1, b: 2, c: 3, d: 4 }
const clone = (({ b, c, ...o }) => o)(obj) // remove b and c
console.log(clone)

lodash

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_.omit(x, 'b')

Posted on
  • 早安，所有善良而勇敢的人们
  • 坏人们，颤抖吧

关掉 vue has been registered but not used

package.json 的 eslintConfig（如果已经有 eslintrc.js ）

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"rules": {
  "vue/no-unused-components": "off"
}

clone object 三种

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let a = {a:1,b:{c:{d:2}}}

{...a}

Object.assign({},a)

JSON.parse(JSON.stringify(food))

via https://www.samanthaming.com/tidbits/70-3-ways-to-clone-objects/

padStart

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const purchase = [
  ['Masks', '9.99'],
  ['Shirt', '20.00'],
  ['Jacket', '200.00'],
  ['Gloves', '10.00'],
];

purchase.forEach(([item, price]) => {
  console.log(item + price.padStart(20 - item.length));
});

两头对齐

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Masks           9.99
Shirt          20.00
Jacket        200.00
Gloves         10.00
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const bankNumber = '2222 2222 2222 2222';
const last4Digits = bankNumber.slice(-4);

last4Digits.padStart(bankNumber.length, '*');
// ***************2222

类似滴：

  • trimStart(trimLeft) 去除前空格
  • trimEnd(trimRight) 去除后空格
  • trim() 去除前后空格

shadow copy

  • spread operator {…} […]
  • array slice
  • Object.assign
  • Array.from

deep copy

deep copy (or deep clone): lodash _.cloneDeep, Ramda, a custom function, JSON.parse() / JSON.stringify(), and rfdc

For the best performance, the library rfdc (Really Fast Deep Clone) will deep copy about 400% faster than lodash’s _.cloneDeep

https://medium.com/javascript-in-plain-english/how-to-deep-copy-objects-and-arrays-in-javascript-7c911359b089

Posted on

const a = new Object();

对象字面量

const a = {};

属性增强写法

es5

const a = '123' const obj = { a:a }

es6

const a = '123' const obj = { a } // 属性从同名变量找

函数增强写法

es5

`
const a = {
a:function(){

}
}
`

es6

`
const a = {
a(){

}
}
`

字符串模版

const skill = '安邦' const david =文能${skill}

ES6对象键计算表达式

var heat = '50%'; var field = 'Rock and Roll'; var music = { [field.toLowerCase()]: heat } console.log(music); // Object {rock and roll: "50%"}

对象解构

let music = { type: 'rock', heat: '50%' }; let { type, heat } = music; console.log(type, heat); // rock 50%

对象解构 重命名

let music = { type: 'rock', heat: '50%' } let { type: aaa, heat: bbb } = music; console.log(aaa, bbb); // rock 50%

数组解构

let people = [20, 25, 30] let [young, oldYoung] = people; console.log(young, oldYoung) // 20 25

Posted on

战斗机

https://zh.wikipedia.org/wiki/%E6%AD%BC-10

11 15 16 20 35 22

mac Add The Recent Items Stack To The Dock

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defaults write com.apple.dock persistent-others -array-add '{ "tile-data" = {"list-type" = 1; }; "tile-type" = "recents-tile";}' && \killall Dock

signal

手机扫描二维码 藏在 设置 - 已关联设备

将 Signal Desktop 与手机关联的步骤：

安装并打开 Signal Desktop。
在你的手机上，打开信速达转到信速达的设置界面profile_avatar.png > 登录过的设备。
按下+图标(安卓)或是”登录新的设备”(苹果)
用你的手机来扫描二维码。
选取一个你登录过的设备然后点击完成。
从 Signal Desktop 发送一条信息。