大约有 15,000 项符合查询结果（耗时：0.0263秒） [XML]
How to save an HTML5 Canvas as an image on a server?
I'm working on a generative art project where I would like to allow users to save the resulting images from an algorithm. The general idea is:
...
Why does javascript replace only first instance when using replace? [duplicate]
...
You need to set the g flag to replace globally:
date.replace(new RegExp("/", "g"), '')
// or
date.replace(/\//g, '')
Otherwise only the first occurrence will be replaced.
...
Escape string for use in Javascript regex [duplicate]
I am trying to build a javascript regex based on user input:
1 Answer
1
...
js实现ReplaceAll全部替换 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...表可以达成Replace 的效果。正则表达式：
str.replace(/word/g,"newWord")
g 的意义是：执行全局匹配（查找所有匹配而非在找到第一个匹配后停止）。
以上写法有个类同的写法：
str.replace(new RegExp("word","gm"),"newWord")
g 执行全局匹配...
Python - How to sort a list of lists by the fourth element in each list? [duplicate]
I would like to sort the following list of lists by the fourth element (the integer) in each individual list.
2 Answers
...
What is the difference between DSA and RSA?
It appears they are both encryption algorithms that require public and private keys. Why would I pick one versus the other to provide encryption in my client server application?
...
What is the difference between std::array and std::vector? When do you use one over other? [duplicat
...t means its size is fixed at compile time and it will be allocated as a single chunk (e.g. taking space on the stack). The advantage it has is slightly better performance because there is no indirection between the object and the arrayed data.
std::vector is a small class containing pointers into ...
Why is document.write considered a “bad practice”?
I know document.write is considered bad practice; and I'm hoping to compile a list of reasons to submit to a 3rd party vendor as to why they shouldn't use document.write in implementations of their analytics code.
...
Bash variable scope
...
Because you're piping into the while loop, a sub-shell is created to run the while loop.
Now this child process has its own copy of the environment and can't pass any
variables back to its parent (as in any unix process).
Therefore you'll need...
MySQL load NULL values from CSV data
...ets the actual field value to NULL, if the local variable ends up containing an empty string:
LOAD DATA INFILE '/tmp/testdata.txt'
INTO TABLE moo
FIELDS TERMINATED BY ","
LINES TERMINATED BY "\n"
(one, two, three, @vfour, five)
SET four = NULLIF(@vfour,'')
;
If they're all possibly empty, then yo...