flutter头部折叠,flutter 旋转

找英语身体习语,谚语~

Water taro, autumn back in August, September 9 down the wind, little Spring in October, November frost or snow fall, winter and again in December to freeze.

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3, Spring accounted for the winter on the 10th.

4, the first month flowers, February willow, March frozen scaffold.

5, 28 chaotic dressing, 39 grass-sa wear; in March to wear three samples in April wearing a mosquito net. --- Refers to changeable spring weather.

6, 28 a good sail.

7, spring chill rain that splashed, dry cold winter crying.

8, spring kid face, day to three changes.

9, Spring 18 rice difficult.

10, March in March, a day peeling, on the 3rd covers it.

11, in March and a half, was not to be cold enough to 100 Tagishi.

12, April eighth day Prince urine.

13, May take the Hill

14, May fifth day of dragon boat in water, May 13 knife off the water.

15, May Day is not eating rice dumplings, breaking kh Gan Qiu Fang.

16, June no wind Taiwan, there are access roads to the rain.

17, June Shijiu San plate new.

18, in June without good north.

19, June day, in July fire, stone will be baking cakes.

20, Liu Qiyue afternoon westerly winds had turned into tigers.

21, Northwest Yula Do not be too Tagishi.

22, Northwest rain, and even feeding off the next three.

23, June Liqiu tight Yo, July Liqiu oil after the autumn.

24, July Thick typhoons.

25, no panic in July and a half ghost, only to panic in July and a half of water.

26, in July and a half back to half of the autumn.

27, early in August the rain closed the door.

28, August Zhan, no one knows.

29, August 15, latch off households.

30, autumn and north-west, half close the eyes fertile.

31, burst burst of cold autumn.

32, three days the wind, frost on the 3rd, three days Yan daylight.

33, October rebound.

34, no winter rain for three days.

35, December southerly current report.

36, (December) to see the top junior high, the next to see 18.

37, no Jingzhe first ear really Lei, Sishijiuri Ukraine.

38, Vernal Equinox beans Tsai-shen.

39, Qingming Guyu, cold death of the mother tiger.

40, Lixia Xiao-Man, Tam cave are full.

41, summer solstice is not Do not be too hot, the winter solstice is not too cold not to be.

42, Liqiu Chushu, hot dead rats.

43, after a Chushu night, cold hot during the day.

44, Bailu Taiwan, no one knows.

45, beginning of winter rain may rot in winter and eat wood to make the empty rice.

46, dry winter solstice, Dan-year pocket; Dan Winter Solstice, dry years of pocket.

47, Dahan Osamu, no inner cold.

Swallows flying dragonfly rain precursors, smuggled a small quantity, fish, and water to ventilate abuse, heavy rain to come at once.

Animals of the rain forecast rain precursor Pellet groups of mosquitoes, rain ants appear in groups, cat wash

Frog call and a low Raindance will swallow the frog under the call and a low-flying swallows and so is the rain of the precursor

Flying cockroaches, there are showers cockroaches strong sensitivity to climate change, if at night to see flying cockroaches, indicating a change in the weather, there will be rain.

Spider webs, Jiuyu must be clear for a long time because, under the rain, spider webs can not be predatory, If you see a spider crawl out of webs to illustrate the weather soon turned sunny.

A Choice of a cold, autumn 10 games to put on cotton.

Morning rain that day, sunny, rainy night to dawn.

Rain just before dawn, the sun puddles.

Warm south wind, north wind cold, wind and humid westerly dry.

Jiuyu cold wind swept clean, fine set and reliable.

Sky flying cloud, rain and snow the next stop.

Dark clouds covered the sky, heavy rain faster.

Bright side there is rain, no rain on top of light.

Magpie branches called, to go out day clean.

Mosquito gets the blame, the weather should be bad.

River floating moss, complete with heavy rains come.

Earthworms on the road to climb, rain tangled, mole cricket singing, weather Qinghe

Snake aisle, rain's trillion, toad cockroaches, heavy rain is approaching.

Hair and the sound of a wind.

Stella rise overturned Oh, rain imminent; horses mouth overturned, heavy rain in the former.

Wind is the flow of the atmosphere, the atmosphere is what we commonly known as air. The wind has come from the north, there are come from the South, but also come from another direction. Because all aspects of the geographical attributes are inconsistent, so the wind has its different origin and diverse features. There is cold, there are hot; a dry wind, there are wet wind. Desert blowing in the wind, laden with sand; the surface to the wind, they contain more water vapor. Therefore, we in different wind inside, there is a different feeling, you can see the sky in different scenes. Further, if the two meet in a different style, they can easily conflict, when you can see the phenomenon of sudden change in weather.

Wind is the most likely aware of the phenomenon, so a lot of proverbs on the wind.

* Four Seasons wind and rain mother. (Hunan)

* Dongfeng is fine, no less than have to overcast. (Hubei Zaoyang)

The northern temperate regions and its - is at about 30 ° N where - the rain, brought about mainly due to cyclone. Cyclone action, always from west to east, in front of it thrived for a north-easterly or southeasterly winds. Therefore, Cyclone will go to when the easterly wind will of. Therefore, wind can be seen as a harbinger of future cyclones. Because the cyclone is a storm, the rain is the main factor temperate regions, so we can see that the wind is easterly, so I knew it was a harbinger of rainy days.

* Dongfeng Four Seasons eyes, I'm afraid the sound from wind. (Jiangsu Nanjing)

* Easterly winds blew critical rain. (Shanghai)

* Dongfeng emergency, maintenance and bamboo hat. (Hubei)

* Dongfeng emergency, maintenance and hats, since winds and clouds, the more anxious will rain. ( "Tian Five Elements" theory of wind)

Clouds down the mountain, to quit.

Twisted cloud cloud, rain Lin Lin.

Biotite Jiejia not overcast on the next.

Low clouds to rain, cloud height became fine.

Bright sky light up, the river rose Yi Zhang.

Red Cloud dark cloud, there must be big rain.

Sky beans Britain cloud, the ground Shaisi people.

Sunset clouds up, middle of the night listen to the rain sound.

Sunset Carmine, non-rain is the wind.

Sunset clouds away the rain after midnight.

Treadmill sky clouds, the ground rain Lin Lin.

Northwest from black clouds, thunderstorms will come.

Clouds from the Northeast, the there must be wind and rain.

Rain Hill wearing a hat, no rain Hill did not waist.

Spot scales the sky, sun valley do not turn.

Are not afraid of rain, a long time, as long as the Northwest spoke up.

Cloud east, with rain turned into the wind, cloud south, water Lian Lian, cloud to the west, Shimoji dressing.

When the rain when the sunny days and nights non-stop.

Clouds intercept the East, not the rain-wind. Chaotic sky top twist, wind and rain to not small.

North Korea has broken Ziyun, afternoon thunderstorms Pro.

2, the wind and weather proverbs

Dongfeng emergency, maintenance bamboo hat.

Hot wind, thunderstorms, strong.

Yi Qing pelting rain, slow rain did not open.

Health wind after the rain, the future is more ominous rain.

Shortly before rain there is wind and rain, rain no rain non-stop.

Non-easterly winds did not rain, do not scrape the west wind is not clear.

Third, light, electric, acoustic phenomena and weather proverbs

Stars dense, rain flooding back.

Star thin, good weather.

Star-ming, someday clear.

Stars blink, rain can not afford.

Direct flash rain, Wang flash rain.

Thunderstorm fried small, stuffy big thunderstorm.

Thunder zenith, though rain is not fierce.

Horizon thunder, heavy rain incessantly.

Xiaoshu soon as mine, so Huang reverse.

Southern flash fire door, the North flash rain provisional.

4, the biological response and the weather proverbs

Loach jumped the rain came.

Loach quiet, the weather was clear.

Frog calls, heavy rain to.

Chicken into the cage late trillion rain.

Swallows flying to rain.

Smuggled a small quantity morning and evening to the next.

Bee nest return late visit to Japan is good weather.

Water fish jump, wind and rain came.

Dragonfly flying too low, go out with enterprises.

Black dragonfly chaos, the weather should be dry.

Flutter to smoke, rain incessantly.

Tank to wear skirts, heavy rain Lin Lin.

Rain days will be damp salty things.

Pillar at the foot of tide and rain.

Cao Hui formed cakes, days of wind and rain provisional.

The water pan moss, days of the storm comes. Clouds down the mountain, to quit.

Twisted cloud cloud, rain Lin Lin.

Biotite Jiejia not overcast on the next.

Low clouds to rain, cloud height became fine.

Bright sky light up, the river rose Yi Zhang.

Red Cloud dark cloud, there must be big rain.

Sky beans Britain cloud, the ground Shaisi people.

Sunset clouds up, middle of the night listen to the rain sound.

Sunset Carmine, non-rain is the wind.

Sunset clouds away the rain after midnight.

Treadmill sky clouds, the ground rain Lin Lin.

Northwest from black clouds, thunderstorms will come.

Clouds from the Northeast, the there must be wind and rain.

Rain Hill wearing a hat, no rain Hill did not waist.

Spot scales the sky, sun valley do not turn.

Are not afraid of rain, a long time, as long as the Northwest spoke up.

Cloud east, with rain turned into the wind, cloud south, water Lian Lian, cloud to the west, Shimoji dressing.

When the rain when the sunny days and nights non-stop.

Clouds intercept the East, not the rain-wind. Chaotic sky top twist, wind and rain to not small.

North Korea has broken Ziyun, afternoon thunderstorms Pro.

2, the wind and weather proverbs

Dongfeng emergency, maintenance bamboo hat.

Hot wind, thunderstorms, strong.

Yi Qing pelting rain, slow rain did not open.

Health wind after the rain, the future is more ominous rain.

Shortly before rain there is wind and rain, rain no rain non-stop.

Non-easterly winds did not rain, do not scrape the west wind is not clear.

Third, light, electric, acoustic phenomena and weather proverbs

Stars dense, rain flooding back.

Star thin, good weather.

Star-ming, someday clear.

Stars blink, rain can not afford.

Direct flash rain, Wang flash rain.

Thunderstorm fried small, stuffy big thunderstorm.

Thunder zenith, though rain is not fierce.

Horizon thunder, heavy rain incessantly.

Xiaoshu soon as mine, so Huang reverse.

Southern flash fire door, the North flash rain provisional.

4, the biological response and the weather proverbs

Loach jumped the rain came.

Loach quiet, the weather was clear.

Frog calls, heavy rain to.

Chicken into the cage late trillion rain.

Swallows flying to rain.

Smuggled a small quantity morning and evening to the next.

Bee nest return late visit to Japan is good weather.

Water fish jump, wind and rain came.

Dragonfly flying too low, go out with enterprises.

Black dragonfly chaos, the weather should be dry.

Flutter to smoke, rain incessantly.

Tank to wear skirts, heavy rain Lin Lin.

Rain days will be damp salty things.

Pillar at the foot of tide and rain.

Cao Hui formed cakes, days of wind and rain provisional.

The water pan moss, days of the storm comes.

Clouds down the mountain, to quit.

Twisted cloud cloud, rain Lin Lin.

Biotite Jiejia not overcast on the next.

Low clouds to rain, cloud height became fine.

Bright sky light up, the river rose Yi Zhang.

Red Cloud dark cloud, there must be big rain.

Sky beans Britain cloud, the ground Shaisi people.

Sunset clouds up, middle of the night listen to the rain sound.

Sunset Carmine, non-rain is the wind.

Sunset clouds away the rain after midnight.

Treadmill sky clouds, the ground rain Lin Lin.

Northwest from black clouds, thunderstorms will come.

Clouds from the Northeast, the there must be wind and rain.

Rain Hill wearing a hat, no rain Hill did not waist.

Spot scales the sky, sun valley do not turn.

Are not afraid of rain, a long time, as long as the Northwest spoke up.

Cloud east, with rain turned into the wind, cloud south, water Lian Lian, cloud to the west, Shimoji dressing.

When the rain when the sunny days and nights non-stop.

Clouds intercept the East, not the rain-wind. Chaotic sky top twist, wind and rain to not small.

North Korea has broken Ziyun, afternoon thunderstorms Pro.

2, the wind and weather proverbs

Dongfeng emergency, maintenance bamboo hat.

Hot wind, thunderstorms, strong.

Yi Qing pelting rain, slow rain did not open.

Health wind after the rain, the future is more ominous rain.

Shortly before rain there is wind and rain, rain no rain non-stop.

Non-easterly winds did not rain, do not scrape the west wind is not clear.

Third, light, electric, acoustic phenomena and weather proverbs

Stars dense, rain flooding back.

Star thin, good weather.

Star-ming, someday clear.

Stars blink, rain can not afford.

Direct flash rain, Wang flash rain.

Thunderstorm fried small, stuffy big thunderstorm.

Thunder zenith, though rain is not fierce.

Horizon thunder, heavy rain incessantly.

Xiaoshu soon as mine, so Huang reverse.

Southern flash fire door, the North flash rain provisional.

4, the biological response and the weather proverbs

Loach jumped the rain came.

Loach quiet, the weather was clear.

Frog calls, heavy rain to.

Chicken into the cage late trillion rain.

Swallows flying to rain.

Smuggled a small quantity morning and evening to the next.

Bee nest return late visit to Japan is good weather.

Water fish jump, wind and rain came.

Dragonfly flying too low, go out with enterprises.

Black dragonfly chaos, the weather should be dry.

Flutter to smoke, rain incessantly.

Tank to wear skirts, heavy rain Lin Lin.

Rain days will be damp salty things.

Pillar at the foot of tide and rain.

Cao Hui formed cakes, days of wind and rain provisional.

The water pan moss, days of the storm comes.

学web前端有前途吗

一   学习前端这门技术有前途吗?

1、行业发展好。

就说我们目前中国所有行业,可以说任何一个行业都离不开互联网,现在的人们对于互联网的依赖很大,互联网行业在中国无疑是现在发展前景最好的没有之一。web前端现在虽然竞争大,刚开始工作并不是那么好找,但是它未来所需要的人才是可观的,只有你拥有这个技术,作为web互联网+时代,用户体验现在成为了企业的第一标准,web前端当然待遇是水涨船高的。

2、人才需求大。

现在的人们离不开手机,我们现在手机的各种应用都是用代码写成的,互联网对人们的影响越来越大,根据新闻报道未来中国20年,需要软件开发,美工设计,web前端开发人才2000W人才,各类职业也需求更多,前端的人才需求比以前也有了质的飞跃。

3、薪资待遇高。

web前端开发工程师的薪资待遇平均工资已经突破一万,因为其他行业确实工资涨幅不大,所以必然会吸引了大批想要月薪过万的人来转行学习。我想引用乔布斯的一句话:WEB就是人类的未来,我们身为前端开发工作者也是未来,相信WEB前端开发的明天会更好。

二    零基础小白应该怎么学习前端才能少走弯路?

关于前端这一块的学习,我不主张自学,因为前端的知识体系是很庞大的,如果你自学,遇到一些问题,你自己很难解决,至少需要有专业的前端人士指导你,站在高手的肩膀上,才能看的更高更远,当然很多小伙伴会说,我也知道学习前端有高手指点挺好啊,可是我怎么知道去哪里找高手,高手又为什么愿意指导我呢?

这个问题问的好,其实现在是互联网时代,网上有很多的相关视频和直播课,我平时就经常去上网听一些前端高手讲课。我可以给大家分享一下我在网上听课的地方,老师挺厉害的,每天晚上在网上免费讲两个小时的直播课,也很适合零基础小白,讲的很透彻通俗易懂,让人感觉,原来前端是这么回事,没有想象的那么难,想听前端直播课的同学,可以进入他的前端教程资料裙:首先位于开头的一组数字是:655,其次处于中间地带的一组数字是:567,最后位于尾部的一组数字是:613,把以上三组数字按照先后顺序组合起来即可。作为想从事前端这个行业的小伙伴,一定要有一个平常心,只要能学到知识,去学就是了,不要磨磨唧唧的的做什么事情,否则什么也做不好。

三  学习前端,你需要具备哪些素质?

(1)如果web的任何一个元素(web界面,灵活的编程风格等)有一点吸引了你,让你着实着迷,恭喜你,有了一个完美的开始。确认一下自己是否喜欢和合适前端,而不是为了一份看起来体面而且薪水不菲的工作。

(2)不断学习,每日的积累,关注前端动态,是你跟上前端潮流的主要途径。前端的体系过于庞大,技术框架争涌而出,如果你经常抱怨累死码农的节奏,那就审视一下自己对前端的态度。

(3)主抓基础,避免盲目。前端领域知识点很多,值得学的东西也很多,聪明的人懂得花时间学习成体系的知识并且研究得足够深入,而不是盲目的看到别人用什么框架就去学什么。只停留在实践运用的阶段,到头来框架们都一个一个被淘汰,你仍在原地踏步。

(4)整理总结,先模仿后创造。将每日的积累做好规整,记录到博客也好,笔记也好。多看看牛人的源代码,等你达到了一定的层次水准,自然会得心应手。

(5)持有一颗造福前端社区的心。写一些有意思的小工具、插件,推广出去, 始终坚信,在从事前端的道路上You are not alone。

(6)要有专业人士的指导,尤其是学习前端找工作的,不要妄想自己一个人自学前端能找到工作,现在非常难,如果没有一个明白人帮你解决一下问题,会有非常多的弯路,中间很容易放弃,学习的不专业不说,最重要是浪费时间。

(7)一个好的心态和一个坚持的心很重要,很多冲着高薪的人想学习前端,但是能学到最后的没有几个,遇到困难就放弃了,这种人到处都是,就是因为有的东西难,所以他的回报才很大,我们评判一个前端开发者是什么水平,就是他解决问题的能力有多强。

四  入门web前端开发需要学习什么?

第一,基础部分的学习。

主要就是html、css、Java。这个其实不用多讲,这些个基础不学扎实了什么也干不了,可以直接从html5、css3、ES5来学习。

第二,与美工相关、后端开发、设计相关的学习。

想做好Web前端开发,一定搞清楚自己的工作界面在什么地方,这对你有很大帮助。每个公司可能都不一样,所以了解边界相关的知识就很重要。

美工相关,主要是说ps、切图之类的东西,photoshop还是需要会用的,至于说你能不能搞出漂亮的图片来那倒不是重点,关键点是体会美工的工作过程。如果你在公司兼了这件事,那你就得深入的学习了,别不以为然,前端的美术有修养还是挺重要的。

后端开发,虽说一般情况下,前端开发和后端开发是分开的,不过二般情况也很多。这个时候就需要你在后端中选择一条主线,很多人都在比较PHP、Python、Node.js哪种好,其实都差不多,不过从市场上的热度来说视乎Node.js更热一些,当然Node.js对js熟悉的前端来说也更容易上手。

相关标准,标准这个东西很多人都很不屑。其实很重要,越大的团队越重要。还是熟悉熟悉养成好的习惯微妙。这在初期至少涉及到很多兼容性问题,所以W3C的标准是必须了解和掌握的。

第三,各种框架类库的学习。

jquery,bootstrap等,现在的框架比较多,但是jquery和bootstrap这样级别的必须得熟练掌握,要不很多公司都没法干活。一般类库和框架都有垂直的网站可以学习,如bootstrap中文网之类的都很不错。

第四,对于工具的学习。

如Git、webpack、Gulp、github、Nginx 等等。工具本身实际上不学也能干活,从学习的角度来说,这个时间的分配上可以少一点儿,但是从工作的角度来说,如果需要的话要尽快上手,逐步熟悉。工具类的东西都不是特别难上手,几天可能就差不多了,但是想玩的透,极大的提高效率这个还是需要投入不少时间的。

Flutter 之列表和头部 (ListView + Header)

上一篇介绍Banner的开发。在大多数应用场景中。banner和ListView通常是一起显示的。 并且能够共同滑动。例如如下界面:

要实现上图的界面,直接想到是ListView添加Header。但在Flutter中,ListView 组件相当于RecyclerView,所以添加Header也用RecyclerView的原理:

封装ListPage组件,list_page.dart

使用及测试:异步加载网络数据使用


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