"TI-TRS3238E.pdf: RS232收发器特性及应用"

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TI-TRS3238E.pdf is a datasheet for an RS232 transceiver, which is a high-performance, low-power, low-voltage, single-driver/receiver device designed for portable and battery-powered systems. The transceiver features a wide operating voltage range and is capable of operating over a -40°C to 85°C temperature range. It also offers a standby mode that reduces power consumption and extends battery life. The device is suitable for a variety of applications including portable instruments, notebook and palmtop computers, cellular phones, data loggers, and peripherals. The transceiver features four drivers and three receivers, allowing for full-duplex data communication. It also includes a force-on and force-off control pin, as well as an invalid pin that is activated when the receiver output is disabled. The transceiver comes in a variety of package options, including DB, DW, PW, and RHB packages. The pin configuration and top view of each package are detailed in the datasheet. In terms of electrical characteristics, the transceiver has a wide input voltage range, a low input threshold, and a high output drive. It also features a 3-state output with high impedance during power-off conditions, as well as a low-power shutdown mode. The device is equipped with built-in protection features such as short-circuit protection, thermal shutdown, and overvoltage protection. In summary, the TI-TRS3238E.pdf datasheet provides detailed information about the RS232 transceiver, including its features, pin configuration, package options, and electrical characteristics. It is a versatile and high-performance device suitable for a wide range of portable and battery-powered applications. The datasheet serves as a valuable resource for engineers and designers looking to integrate the transceiver into their designs and develop innovative and reliable products.

TI-TRSF3238E.pdf

2023-01-31 上传
RS232收发器

改成获取这个网站的数据https://www.yoojia.com/rank/1-0-0-0-0-0.ht

2023-06-09 上传
trs = table.find_all("tr") #定义数据容器 data = [] #遍历所有 tr标签 for i in trs[1:]: #定义零时容器 list = [] #定位tr里头的所有td标签 tds = i.find_all("td") #遍历所有td标签 for td in...

$(document).on('keydown', '.layui-table-edit', function (e) { var td = $(this).parent('td'), tr = td.parent('tr'), trs = tr.parent().parent().find("tr"), tr_index = tr.index(), td_index = td.index(), td_last_index = tr.find('[data-edit="text"]:last').index(), td_first_index = tr.find('[data-edit="text"]:first').index(); switch (e.keyCode) { case 13: //enter case 39: //右 td.nextAll('[data-edit="text"]:first').click(); if (td_index == td_last_index) { tr.next().find('td').eq(td_first_index).click(); if (tr_index == trs.length - 1) { trs.eq(0).find('td').eq(td_first_index).click(); } } setTimeout(function () { $('.layui-table-edit').select() }, 0); break; case 37: //左 td.prevAll('[data-edit="text"]:first').click(); setTimeout(function () { $('.layui-table-edit').select() }, 0); break; case 38: //上 tr.prev().find('td').eq(td_index).click(); setTimeout(function () { $('.layui-table-edit').select() }, 0); break; case 40: //下 tr.next().find('td').eq(td_index).click(); setTimeout(function () { $('.layui-table-edit').select() }, 0); break;

2023-05-24 上传
这段代码是对于一个表格进行键盘事件的监听，主要是为了方便用户在表格中进行快速编辑和跳转。根据不同的按键，会执行不同的操作，比如回车键或右箭头键会跳转到下一个可编辑单元格，左箭头键会跳转到上一个可编辑...

html中var trs = document.querySelector('tbody').querySelectorAll('tr')

2023-06-07 上传
具体来说，这段代码首先使用 `document.querySelector('tbody')` 获取页面中第一个 `<tbody>` 元素，然后使用 `querySelectorAll('tr')` 方法获取该元素下所有的 `<tr>` 元素，并将它们保存在一个名为 `trs` 的变量...

上述天气数据爬取代码出现了以下的报错---------- AttributeError Traceback (most recent call last) <ipython-input-38-dac61bcc66b2> in <module> 12 soup = BeautifulSoup(html, "html.parser") 13 table = soup.find("table", {"class": "t1"}) ---> 14 trs = table.find_all("tr") 15 for tr in trs[1:]: 16 tds = tr.find_all("td") AttributeError: 'NoneType' object has no attribute 'find_all' 怎么解决

2023-06-09 上传
trs = table.find_all("tr") if trs is not None: for tr in trs[1:]: # 处理表格数据 else: print("找不到表格行") else: print("找不到表格") ``` 如果表格确实存在，但是你仍然遇到了这个错误，可能是...

trs=tbody.find_all("tr") AttributeError: 'NoneType' object has no attribute 'find_all'

2023-11-10 上传
这个错误通常是因为`tbody`对象为`None`，而`None`对象没有`find_... trs = tbody.find_all('tr') # do something with trs else: # handle case where tbody is None else: # handle case where table is None ```

纯html和js的增删改查页面

2023-05-26 上传
if (trs[i].getElementsByTagName("td")[0].innerHTML == id) { trs[i].getElementsByTagName("td")[1].innerHTML = name; trs[i].getElementsByTagName("td")[2].innerHTML = age; break; }...

thead固定 tbody滚动

2023-05-26 上传
实现thead固定，tbody滚动的方式可以通过以下步骤： 1. 给tbody设置固定高度和overflow-y属性为scroll，使得tbody可以滚动。... trs[j].querySelectorAll('td')[i].style.width = thWidth + 'px'; } } ```

出现了错误C:\Users\28269\PycharmProjects\pythonProject\venv\Scripts\python.exe C:\Users\28269\PycharmProjects\pythonProject\venv\ojhj.py Traceback (most recent call last): File "C:\Users\28269\PycharmProjects\pythonProject\venv\ojhj.py", line 26, in <module> trs = table.find_all("tr") AttributeError: 'NoneType' object has no attribute 'find_all'

2023-06-09 上传
trs = table.find_all("tr") #定义数据容器 data = [] #遍历所有 tr标签 for i in trs[1:]: #定义零时容器 list = [] #定位tr里头的所有td标签 tds = i.find_all("td") #遍历所有td标签 for ...

运行soup = BeautifulSoup(html, "html.parser") table = soup.find("table", {"class": "content"}) trs = table.find_all("tr")这段 出现AttributeError: 'NoneType' object has no attribute 'find_all'错误怎么解决

2023-06-09 上传
你可以使用 `if` 语句检查 `table` 和 `trs` 是否成功找到了相应的标签和属性，例如： ``` if table is not None: trs = table.find_all("tr") if trs is not None: # 处理表格数据 else: print("找不到表格行...
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