大约有 40,000 项符合查询结果（耗时：0.0335秒） [XML]
Simplest/Cleanest way to implement singleton in JavaScript?
... pattern:
short form
var Foo = function () {
"use strict";
if (Foo._instance) {
//this allows the constructor to be called multiple times
//and refer to the same instance. Another option is to
//throw an error.
return Foo._instance;
}
Foo._instance = t...
What is Java String interning?
...nterning is implemented magically and efficiently with a dedicated CONSTANT_String_info struct (unlike most other objects which have more generic representations):
A string literal is a reference to an instance of class String, and is derived from a CONSTANT_String_info structure (§4.4.3) in th...
trying to animate a constraint in swift
...t tapGesture = UITapGestureRecognizer(target: self, action: #selector(doIt(_:)))
textView.addGestureRecognizer(tapGesture)
}
@objc func doIt(_ sender: UITapGestureRecognizer) {
heightConstraint.constant = heightConstraint.constant == 50 ? 150 : 50
UIView.animate(with...
mfc 按钮变成了非xp风格、界面变成windows经典样式？ - C++ UI - 清泛IT社...
...格 xp风格
stdafx.h中添加：
#ifdef _UNICODE
#if defined _M_IX86
#pragma comment(linker,"/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='x86' publicKeyToken='6595b64144ccf1df' langu...
“Unknown provider: aProvider
...iable name was you can change how uglify mangles the variables:
../node_modules/grunt-contrib-uglify/node_modulesuglify-js/lib/scope.js
SymbolDef.prototype = {
unmangleable: [...],
mangle: function(options) {
[...]
this.mangled_name = s.next_mangled(options, this)+"_orig_"+this.ori...
How to copy a row and insert in same table with a autoincrement field in MySQL?
...
Use INSERT ... SELECT:
insert into your_table (c1, c2, ...)
select c1, c2, ...
from your_table
where id = 1
where c1, c2, ... are all the columns except id. If you want to explicitly insert with an id of 2 then include that in your INSERT column list and your SE...
What's the difference between lists and tuples?
...e pairs of page and line number to reference locations in a book, e.g.:
my_location = (42, 11) # page number, line number
You can then use this as a key in a dictionary to store notes on locations. A list on the other hand could be used to store multiple locations. Naturally one might want to ad...
What are conventions for filenames in Go?
...
There's a few guidelines to follow.
File names that begin with "." or "_" are ignored by the go tool
Files with the suffix _test.go are only compiled and run by the go test tool.
Files with os and architecture specific suffixes automatically follow those same constraints, e.g. name_linux.go will...
What does the brk() system call do?
...rge (say, >128K) allocations. See, for instance, the discussion of MMAP_THRESHOLD in the Linux malloc(3) manpage.
– zwol
Aug 9 '11 at 15:26
1
...
How to deep copy a list?
...
E0_copy is not a deep copy. You don't make a deep copy using list() (Both list(...) and testList[:] are shallow copies).
You use copy.deepcopy(...) for deep copying a list.
deepcopy(x, memo=None, _nil=[])
Deep copy operat...