大约有 44,000 项符合查询结果（耗时：0.0636秒） [XML]
How does “this” keyword work within a function?
...at's attached to an object
var foo = {};
foo.someMethod = function(){
alert(this);
}
When invoked as a method, this will be bound to the object the function/method is a part of. In this example, this will be bound to foo.
As A Function
If you have a stand alone function, the this variable ...
How can I have a newline in a string in sh?
...ability.
You can also try and insert the newline directly into your shell script (if a script is what you're writing) so it looks like...
#!/bin/sh
echo "Hello
World"
#EOF
or equivalently
#!/bin/sh
string="Hello
World"
echo "$string" # note double quotes!
...
JavaScript OR (||) variable assignment explanation
... " messages.";
var noNewMessagesText = "Sorry, you have no new messages.";
alert((messages && newMessagesText) || noNewMessagesText);
Inside the alert, we check if messages is falsy, and if yes, then evaluate and return noNewMessagesText, otherwise evaluate and return newMessagesText. Sinc...
What does the “|” (single pipe) do in JavaScript?
... 1 1 1 0 = 14 (8 + 4 + 2)
Bitwise ORing 6 and 10 will give you 14:
alert(6 | 10); // should show 14
Terribly confusing!
share
|
improve this answer
|
follow
...
javascript check for not null
...
this will do the trick for you
if (!!val) {
alert("this is not null")
} else {
alert("this is null")
}
share
|
improve this answer
|
follo...
using jquery $.ajax to call a PHP function
This may be a simple answer, but I'm using jQuery's $.ajax to call a PHP script. What I want to do is basically put that PHP script inside a function and call the PHP function from javascript.
...
Rails 4: how to use $(document).ready() with turbo-links
...
Here's what I do...
CoffeeScript:
ready = ->
...your coffeescript goes here...
$(document).ready(ready)
$(document).on('page:load', ready)
last line listens for page load which is what turbo links will trigger.
Edit...adding Javascript vers...
Detect if a page has a vertical scrollbar?
...ow height :)
if ($("body").height() > $(window).height()) {
alert("Vertical Scrollbar! D:");
}
// Check if body width is higher than window width :)
if ($("body").width() > $(window).width()) {
alert("Horizontal Scrollbar! D:<");
}
});
...
JavaScript REST client Library [closed]
...amp;Age=10', // or $('#myform').serializeArray()
success: function() { alert('PUT completed'); }
});
You can replace PUT with GET/POST/DELETE or whatever.
share
|
improve this answer
...
Add new value to an existing array in JavaScript [duplicate]
...ay
// ---
arr = []; // empty array
// ---
arr = new Array(3);
alert(arr.length); // 3
alert(arr[0]); // undefined
// ---
arr = [3];
alert(arr.length); // 1
alert(arr[0]); // 3
Pushing to the array:
arr = [3]; // arr == [3]
arr[1] = 4; // arr == [3, 4]
arr[2] = 5; // arr...