我知道我可以使用以下代码删除vanilla Javascript中的行:
var table = document.getElementById('table');
function deleteRow () {
table.deleteRow(1);
};Run Code Online (Sandbox Code Playgroud)
table { background: #ccc; width: 100%; }
table thead { background: #333; color: #fff; }
table tbody { background: magenta; color: #fff; }Run Code Online (Sandbox Code Playgroud)
<button onclick="deleteRow()">Delete Row</button>
<table id="table">
<thead>
<tr>
<td>foo</td>
<td>bar</td>
</tr>
</thead>
<tbody>
<tr>
<td>lorem</td>
<td>ipsum</td>
</tr>
</tbody>
<tbody>
<tr>
<td>lorem</td>
<td>ipsum</td>
</tr>
</tbody>
</table>Run Code Online (Sandbox Code Playgroud)
但是这段代码留下了一个空的tbody标签.JS有删除thead和tfoot元素的方法,但它似乎缺少deleteTbody一个.
我怎么应该tbody只使用纯javascript 删除一个及其所有内容?请不要jQuery!
所以我正在创建一个这样的字典:
request = {"method": "get"}
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当我尝试列出属性时
print list(request.keys())
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我得到了我所期望的:
['method']
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我可以访问该method属性
print request['method']
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我得到了我所期望的:
get
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但如果我尝试
print request.method
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我收到一个错误
AttributeError: 'dict' 对象没有属性 'method'
为什么我在.使用方括号时出现错误但不是?
我试图在命令行上尝试一个简单的命令,
dict(zip(ascii_lowercase, range(4)))
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期待得到
{'a': 0, 'b': 1, 'c': 2, 'd': 3}
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但我一直在收到错误
Traceback(最近一次调用最后一次):
文件"
<stdin>",第1行,in<module>NameError:未定义名称"ascii_lowercase"
我在这里错过了什么?
做一个yarn upgrade今天我看到警告:
警告"react-test-renderer@15.6.1"有不正确的同伴依赖"react@^15.6.1"
我已经尝试升级react-test-renderer,但这并没有改变任何东西.
我需要做什么?
我正在尝试使用 AWS CLI 创建 Elastic Beanstalk 环境
aws elasticbeanstalk create-environment \
--application-name my-application \
--environment-name my-environment \
--region us-east-1 \
--solution-stack-name "64bit Amazon Linux 2015.09 v2.0.6 running Docker 1.7.1" \
--version-label my-version
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但这会将所有内容转储到默认 VPC 中,而我想将其放入特定(非默认)VPC 中。我知道这可以通过 AWS Web 界面来完成。可以用CLI来完成吗?创建环境文档中没有提及选择 VPC 。
INSERT INTO `student`(`Name`, `Student_number`, `Class`, `Major`)
VALUES (Smith,17,1,CS),(Brown,8,2,CS)
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1054 - "字段列表"中的未知列"Smith"
我从http://dev.mysql.com/doc/refman/5.1/en/insert.html看,但我仍然有错误.
我不明白我错过了什么.
我的学生表是
name char(30),
Student_number int primary key,
Class int,
Major char(30)
Run Code Online (Sandbox Code Playgroud) 是否可以通过管道将变量传递给@name属性?
import xml.etree.ElementTree as ET\ntree = ET.parse(\'C:/test.xml\')\nroot = tree.getroot()\n\nsomelist = [x.text for x in root.findall(".//actionList[@name=\'VARIABLEHEREinsteadoftext\']//value")]\nRun Code Online (Sandbox Code Playgroud)\n\n我需要仅从按名称过滤的特定操作列表中获取所有值,并忽略所有其他操作列表。它可以很好地与
\n\n[@name="ACTIONLISTNAME"]\nRun Code Online (Sandbox Code Playgroud)\n\n但我\xc2\xb4d喜欢这样的东西:
\n\nX = ACTIONLISTNAME\n[@name=X]\nRun Code Online (Sandbox Code Playgroud)\n\n提前致谢!
\n我正在开发一个Django(1.9.2)项目,我需要连接到MySQl数据库,我正在尝试使用推荐的mysqlclient库.但是,当我尝试安装时,pip install mysqlclient我收到以下错误:
Run Code Online (Sandbox Code Playgroud)Complete output from command python setup.py egg_info: sh: mysql_config: command not found Traceback (most recent call last): File "<string>", line 1, in <module> File "/private/var/folders/v9/vxdt4wms0_qgm9n10rt74p8m0000gn/T/pip-build-Xh__3p/mysqlclient/setup.py", line 17, in <module> metadata, options = get_config() File "setup_posix.py", line 44, in get_config libs = mysql_config("libs_r") File "setup_posix.py", line 26, in mysql_config raise EnvironmentError("%s not found" % (mysql_config.path,)) EnvironmentError: mysql_config not found
我在哪里需要创建这个缺失mysql_config?
所以,我正在尝试在我的服务器上创建一个PHP表,但即使它正确地连接到我的服务器也没有这样做.这是我的代码:
// alphacrmTableCreate.php | Ryan Castle | 09/04/2014 - This script CREATEs sables tCompany and tPerson in the database 'alphacrm'
{ // Connect and test mySQL and specific DB
$hostname = "localhost";
$username = "root";
$password = "";
$databaseName = "alphacrm";
$dbConnected = @mysql_connect($hostname, $username, $password);
$dbSelected = @mysql_select_db($databaseName, $dbConnected);
$dbSuccess = true;
if ($dbConnected) {
if (!$dbSelected) {
echo "DB connection FAILED<br><br>";
$dbSuccess = false;
} else {
echo "DB connection SUCCESSFUL<br><br>";
$dbSuccess = true;
}
} else
echo …Run Code Online (Sandbox Code Playgroud) tfpdf -Can't open file C:\webprojects\www\diners/font/unifont/DejaVuSansCondensed.ttf这个文件名来自我的windows本地系统?并在尝试从Web主机运行时显示.
require('tfpdf.php');
class PDF extends tFPDF {
function Header(){
global $title;
// Select Arial bold 15
$this->SetFont('Arial','B',15);
// Move to the right
$this->Cell(20);
// Framed title
$this->Cell(150,10,$title,1,0,'C');
// Line break
$this->Ln(20);
}
}
// Which pdf are we going to produce
$report=$_POST['report'];
$pdf = new PDF();
$pdf->AddPage();
$pdf->AddFont('DejaVu','','DejaVuSansCondensed.ttf',true);
$pdf->AddFont('DejaVu','B','DejaVuSansCondensed-Bold.ttf',true);
//$pdf->SetTitle($title);
$jmcFont='Times';
switch($report) {
case "list":
$pdf->SetFont($jmcFont,'B',14);$pdf->Cell(40,10,'Diners');$pdf->Ln(10);
foreach($diners as $d) {
if ($d['attending']==1) {
$x=explode('|',$d['menuchoice']);
$pdf->SetFont($jmcFont,'B',10);
$pdf->Write(5, $d['fname'].' '.$d['sname'].':-');
$pdf-setfont($jmcFont,'',10);
$pdf->Write(5, $starter[$x[0]].'-'.$mains[$x[1]].'-'.$sweet[$x[2]].'Note:'.$d['apology']);
$pdf->Ln(7);
}
}
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代码工作正常,如果 …
我是一个Rust新手并试图读取两个数字并计算他们的商:
use std::io;
enum Option<T> {
None,
Some(T),
}
fn safe_div(n: i32, d: i32) -> Option<i32> {
if d == 0 {
return None;
}
return Some(n / d);
}
fn main() {
println!("Please input your numerator.");
let mut numerator = String::new();
io::stdin()
.read_line(&mut numerator)
.expect("Failed to read line");
println!("Please input your denominator.");
let mut denominator = String::new();
io::stdin()
.read_line(&mut denominator)
.expect("Failed to read line");
match safe_div(numerator, denominator) {
None => println!("Can't divide by zero!"),
Some(v) => println!("Quotient is {}", …Run Code Online (Sandbox Code Playgroud) python ×4
mysql ×3
html-table ×2
php ×2
sql ×2
aws-cli ×1
dictionary ×1
django ×1
elementtree ×1
findall ×1
html ×1
insert ×1
javascript ×1
python-2.7 ×1
reactjs ×1
rust ×1
types ×1
web ×1
xml-parsing ×1
xpath ×1
yarnpkg ×1