大约有 30,000 项符合查询结果（耗时：0.0085秒） [XML]
What is the instanceof operator in JavaScript?
... @Siku-Siku.Com - I don't see any trick to it var zero = 0; alert(zero); zero = "0"; alert(zero) we went from a primitive int to a primitive string without any issues.
– JonH
Oct 18 '12 at 18:05
...
Detect blocked popup in Chrome
... for this message using:
$(window).on('message', function(event) {
alert(event.originalEvent.data.loaded)
});
Hope this helps.
share
|
improve this answer
|
follow...
How to create local notifications?
...l notifications so that at the time I set, my app generates a notification/alert with a customized message?
8 Answers
...
Constructors in JavaScript objects
... {
return color;
};
}
Usage:
var blueBox = new Box("blue");
alert(blueBox.getColor()); // will alert blue
var greenBox = new Box("green");
alert(greenBox.getColor()); // will alert green
share
|
...
Check image width and height before upload with Javascript
..._URL.createObjectURL(file);
img.onload = function () {
alert(this.width + " " + this.height);
_URL.revokeObjectURL(objectUrl);
};
img.src = objectUrl;
}
});
Demo: http://jsfiddle.net/4N6D9/1/
I take it you realize this is only supported in a few...
Parse JSON String into a Particular Object Prototype in JavaScript
... for (var prop in obj) this[prop] = obj[prop];
}
var fooObj = new Foo();
alert(fooObj.test() ); //Prints 6
// INITIALISE A NEW FOO AND PASS THE PARSED JSON OBJECT TO IT
var fooJSON = new Foo(JSON.parse('{"a":4,"b":3}'));
alert(fooJSON.test() ); //Prints 12
...
How to detect if multiple keys are pressed at once using JavaScript?
...s an html element that can be easily referenced in javascript with element
alert(element); // [Object HTMLDivElement]
You don't even have to use document.getElementById() or $() to grab it. But for the sake of compatibility, use of jQuery's $() is more widely recommended.
Just make sure the script ...
Is there a way to create a function from a string with javascript?
... create a function from a string is by using Function:
var fn = Function("alert('hello there')");
fn();
This has as advantage / disadvantage that variables in the current scope (if not global) do not apply to the newly constructed function.
Passing arguments is possible too:
var addition = Func...
jQuery AJAX file upload PHP
...FormData();
form_data.append('file', file_data);
alert(form_data);
$.ajax({
url: 'upload.php', // point to server-side PHP script
dataType: 'text', // what to expect back from the PHP script, if anything
cache: fals...
Check if a user has scrolled to the bottom
...window).scrollTop() + $(window).height() == $(document).height()) {
alert("bottom!");
}
});
You can test it here, this takes the top scroll of the window, so how much it's scrolled down, adds the height of the visible window and checks if that equals the height of the overall content (do...