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When it runs, it creates a global object called Modernizr that contains a set of Boolean properties for each feature it can detect. For example, if a browser supports the canvas API, the Modernizr.canvas property will be true. If the browser does not support the canvas API, the Modernizr.canvas property will be false:
The Math object contains various math-related constants (for example, π) and functions (for example, cosine). (Note that the Math object has no constructor, unlike Array or Date. All its methods are "static", that is "class" methods.) All the trigonometric functions use angles expressed in radians, not degrees or grads.
Access to and manipulation of multiple DOM nodes in jQuery typically begins with calling the $ function with a CSS selector string. This returns a jQuery object referencing all the matching elements in the HTML page. $("div.test"), for example, returns a jQuery object with all the div elements that have the class test. This node set can be ...
Use the ; empty statement [10] or the {} empty block statement the same way as in the C and derivatives examples; Use the undefined or the null expression as a complete statement (an expression statement ) when the previous methods are not allowed by the syntax.
For users that have a lot of scripts installed, reloading them all may take up a lot of time. See Gerbrant.mng.decache and its talk page for example code on how you can let JavaScript remove arbitrary files from your browser cache using an external application.
Ext JS is a composition of classes that has many capabilities. Some examples: an abstract layer for browsers (e.g. Ext.isArray that can be used as a replacement for Array.isArray)
May 2008) (Learn how and when to remove this message) Method chaining is a common syntax for invoking multiple method calls in object-oriented programming languages . Each method returns an object, allowing the calls to be chained together in a single statement without requiring variables to store the intermediate results.
XMLHttpRequest data is subject to this security policy, but sometimes web developers want to intentionally circumvent its restrictions. This is sometimes due to the legitimate use of subdomains as, for example, making an XMLHttpRequest from a page created by foo.example.com for information from bar.example.com will normally fail.