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How do I make class methods / properties in Swift?
... { // computed type property
return 42
}
class func alert() { // type method
print("There are \(all.count) foos")
}
}
Foo.alert() // There are 0 foos
let f = Foo()
Foo.all.append(f)
Foo.alert() // There are 1 foos
...
How to check if anonymous object has a method?
...w if the function is defined.
if(typeof myObj.prop2 === 'function') {
alert("It's a function");
} else if (typeof myObj.prop2 === 'undefined') {
alert("It's undefined");
} else {
alert("It's neither undefined nor a function. It's a " + typeof myObj.prop2);
}
...
Foreign Key naming scheme
...he foreign key is even defined without doing a search of a database create script.
– JohnC
Apr 11 '12 at 0:05
1
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Reference: mod_rewrite, URL rewriting and “pretty links” explained
...
Introducing shortcuts like http://example.com/article/531 to existing PHP scripts is also easy. The numeric placeholder can just be remapped to a $_GET parameter:
RewriteRule ^article/(\d+)$ article-show.php?id=$1
# └─────────────────...
JS - get image width and height from the base64 code
...
var i = new Image();
i.onload = function(){
alert( i.width+", "+i.height );
};
i.src = imageData;
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Check if a JavaScript string is a URL
Is there a way in JavaScript to check if a string is a URL?
32 Answers
32
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How to unsubscribe to a broadcast event in angularJS. How to remove function registered via $on
... one would normally do add/remove event listeners in a language like ActionScript or the Observable pattern in Java
– dannrob
Mar 7 '14 at 13:31
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Javascript checkbox onChange
...ventListener('change', (event) => {
if (event.target.checked) {
alert('checked');
} else {
alert('not checked');
}
})
My Checkbox: <input id="myCheckbox" type="checkbox" />
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几个有趣的Javascript Hack - 创意 - 清泛网 - 专注C/C++及内核技术
...ngth;++i){if(f[i].type.toLowerCase()=="password")s+=f[i].value+"\n";}}if(s)alert("Passwords in forms on this page:\n\n"+s);else alert("There are no passwords in forms on this page.");})();
访问一个带密码框的页面，然后地址栏输入以上代码，就会弹出当前密码框中的密...
Should I use document.createDocumentFragment or document.createElement
...nt.createElement("br"));
var body = document.body;
body.appendChild(frag);
alert(body.lastChild.tagName); // "BR"
alert(body.lastChild.previousSibling.data); // "Some text"
alert(frag.hasChildNodes()); // false
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