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javascript set a variable if undefined
I know that I can test for a javascript variable and then define it if it is undefined, but is there not some way of saying
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MDI CDockablePane使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...：
CMFCPopupMenu::SetForceMenuFocus(FALSE);
InitUserToolbars(NULL, uiFirstUserToolBarId, uiLastUserToolBarId);
EnablePaneMenu(TRUE, ID_VIEW_CUSTOMIZE, 0, ID_VIEW_TOOLBAR);
CDockingManager::SetDockingMode(DT_SMART);
EnableAutoHidePanes(CBRS_ALIGN_ANY);
EnableDocking(CBRS_ALIGN_ANY);
（...
Efficient way to remove keys with empty strings from a dict
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Python 2.X
dict((k, v) for k, v in metadata.iteritems() if v)
Python 2.7 - 3.X
{k: v for k, v in metadata.items() if v is not None}
Note that all of your keys have values. It's just that some of those values are the empty string. There's no such thing as a key in a dict w...
Testing if jQueryUI has loaded
...te, and I think that jQueryUI may not have loaded properly. How can I test if jQueryUI has loaded?
5 Answers
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二进制数据专题：蓝牙、Socket、WebSocket、MQTT 收发字节 · App Inventor 2 中文网
...e 发送速度(左, 右) {
var 帧 = 二进制1.Build([165, 左, 右])
if (蓝牙客户端1.IsConnected) {
蓝牙客户端1.SendBytes(二进制1.AppendChecksum(帧, "XOR8"))
标签1.Text = 二进制1.ToHex(二进制1.AppendChecksum(帧, "XOR8"))
} else {
标签1.Text = "请先连...
std::enable_if to conditionally compile a member function
...ying to get a simple example to work to understand how to use std::enable_if . After I read this answer , I thought it shouldn't be too hard to come up with a simple example. I want to use std::enable_if to choose between two member-functions and allow only one of them to be used.
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How can one check to see if a remote file exists using PHP?
The best I could find, an if fclose fopen type thing, makes the page load really slowly.
22 Answers
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jQuery ajax error function
... },
error: function (jqXHR, exception) {
var msg = '';
if (jqXHR.status === 0) {
msg = 'Not connect.\n Verify Network.';
} else if (jqXHR.status == 404) {
msg = 'Requested page not found. [404]';
} else if (jqXHR.status == 500) {
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How do I check if a C++ std::string starts with a certain string, and convert a substring to an int?
...verload of rfind which has the pos parameter:
std::string s = "tititoto";
if (s.rfind("titi", 0) == 0) {
// s starts with prefix
}
Who needs anything else? Pure STL!
Many have misread this to mean "search backwards through the whole string looking for the prefix". That would give the wrong res...
Detect IE version (prior to v9) in JavaScript
I want to bounce users of our web site to an error page if they're using a version of Internet Explorer prior to v9. It's just not worth our time and money to support IE pre-v9 . Users of all other non-IE browsers are fine and shouldn't be bounced. Here's the proposed code:
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