public static <T, E> List<E> makeTree(List<E> menuList, Function<E, T> pId, Function<E, T> id, Predicate<E> rootCheck, BiConsumer<E, List<E>> setSubChildren) { //按原数组顺序构建父级数据Map,使用Optional考虑pId为null Map<Optional<T>, List<E>> parentMenuMap = menuList.stream(...
W. "How to Obtain an Asymptotic Expansion of a Sequence from an Analytic Identity Satisfied by Its Generating Function." J. Austral. Math. Soc. Ser. A 56, 131-143, 1994.Pólya, G. "On Picture-Writing." Amer. Math. Monthly 63, 689-697, 1956.Ruskey, F. "Information on Rooted Trees...
1、无限滚动长列表 前端的业务开发中会遇到数量很大的列表展示情况,一般的处理方法是使用某种方法分屏分页的加载数据。 通常的做法是检测是否滚动到底,然后进行网络请求操作。 代码语言:javascript 代码运行次数:0 运行 constmaxScrollTop=Math.max(document.body.scrollHeight,document.documentElement.scrollHeight)-window....
<template></template>import{Tree}from'santd';functiondig(path='0',level=3){constlist=[];for(leti=0;i<10;i+=1){constkey=`${path}-${i}`;consttreeNode={title:key,key,};if(level>0){treeNode.children=dig(key,level-1);}list.push(treeNode);}returnlist;}conststart=Date.now();con...
一行代码画爱心 print('\n'.join([''.join([('Love'[(x-y)%len('Love')]if((x*0.05)**2+(y*0.1)**2-1)**3-(x*0.05)**2*(y*0.1)**3<=0else' ')forxinrange(-30,30)])foryinrange(15,-15,-1)])) 拆解一下,能看明白点。
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where . If is the generating function for the number of red-black trees, then (2) (Ruskey). Let be the number of red-black trees with tree leaves, the number of red-rooted trees, and the number of black-rooted trees. All three of the quantities satisfy the recurrence relation (...
So this function must be sufficiently general to handle them all. asTree参数 this only applies when on passes a value for the handlers argument and is used then to determine whether the DOM tree should be returned or the handlers object. 该参数在有传入处理器函数的时候要设置为TRUE,此时,函数...
export function squarifyRatio(ratio, parent, x0, y0, x1, y1) { while (i0 < n) { // Find the next non-empty node. do sumValue = nodes[i1++].value minValue = maxValue = sumValue alpha = Math.max(dy / dx, dx / dy) / (value * ratio) beta = sumValue * sumValue * alpha...
项目中需要渲染一个5000+节点的树组件,但是在引入element Tree组件之后发现性能非常差,无论是滚动、展开/收起节点还是点击节点卡顿都非常明显,利用performance跑一下性能数据发现到问题所在 从上图可以看到,除去Idle之外,总共花费的时间为12s,其中Scripting花了10s ...