周报

2022-10-14

Concept

  1. 关于 vertical-align 的使用,Line-relative values 不会改变基线,之后元素不会被影响。Parent-relative values 会改变基线,之后的元素默认会按照该元素对齐。
    • Parent-relative values
      • baseline
      • sub
      • super
      • text-top
      • text-bottom
      • middle
      • <length>
      • <percentage>
    • Line-relative values
      • top
      • bottom
  2. 关于 scrollIntoView 的使用。

vertical-align

inline element 可以使用 vertical-align 竖直对齐



scrollIntoView

Syntax:

js
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scrollIntoView()
scrollIntoView(alignToTop)
scrollIntoView(scrollIntoViewOptions)
  • alignToTop(Optional)
    • true, Corresponds to scrollIntoViewOptions: {block: "start", inline: "nearest"}. This is the default value.
    • false, Corresponds to scrollIntoViewOptions: {block: "end", inline: "nearest"}.
  • scrollIntoViewOptions(Optional)
    • behavior(Optional)
      Defines the transition animation. One of auto or smooth. Defaults to auto.
    • block(Optional)
      Defines vertical alignment. One of start, center, end, or nearest. Defaults to start.
    • inline(Optional)
      Defines horizontal alignment. One of start, center, end, or nearest. Defaults to nearest.

每日一题

Tree and List

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const root = {
    pId: 0,
    id: 1,
    title: '1',
    children: [
        {
            pId: 1,
            id: 2,
            title: '1-1',
            children: [
                {
                    pId: 2,
                    id: 3,
                    title: '1-1-1'
                }
            ]
        },
        {
            pId: 1,
            id: 4,
            title: '1-2'
        }
    ]
}

const list = [
    {
        pId: 0,
        id: 1,
        title: '1'
    },
    {
        pId: 1,
        id: 2,
        title: '1-1'
    },
    {
        pId: 2,
        id: 3,
        title: '1-1-1'
    },
    {
        pId: 1,
        id: 4,
        title: '1-2'
    }
]

function treeToList(t) {
    const list = [];
    const helperQueue = [t];
    while (helperQueue.length) {
        const node = helperQueue.shift();
        list.push(node);
        if (node.children) {
            helperQueue.push(...node.children);
            delete node.children;
        }
    }
    return list;
}

function listToTree(l) {
    const helperMap = new Map();
    let root;
    for (const item of l) {
        helperMap.set(item.id, item);
        if (item.pId === 0) {
            root = item;
        }
    }
    for (const item of l) {
        const parent = helperMap.get(item.pId);
        if(parent) {
            if(!parent.children) {
                parent.children = []
            }
            parent.children.push(item)
        }
    }
    return root;
}