Get link tag returns error

Why does this return an error?

<link rel="shortcut ic开发者_C百科on" type="image/x-icon" href="gfx/favicon.ico" />

var link = $('link[rel=shortcut icon]');

error:

uncaught exception: Syntax error, unrecognized expression: [rel=shortcut icon]

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You need to put the value of rel in quotes:

var link = $('link[rel="shortcut icon"]');

See the jQuery docs on attribute selectors:

jQuery('[attribute="value"]')

attribute An attribute name.

value An attribute value. Quotes are mandatory.