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jQuery.cssHooks的功能测试

2023-04-11 13:29:00

　　Feature Testing（功能测试）

　　在使供应商特定的CSS属性标准化前，首先要确定浏览器是否支持标准的属性或带浏览器供应商前缀的变种。例如，检查支持border-radius 属性，还要检查该属性的任何变种写法是否是临时元素的 style 对象中的成员。

(function($) {

function styleSupport( prop ) {

var vendorProp, supportedProp,

// capitalize first character of the prop to test vendor prefix

capProp = prop.charAt(0).toUpperCase() + prop.slice(1),

prefixes = [ "Moz", "Webkit", "O", "ms" ],

div = document.createElement( "div" );

if ( prop in div.style ) {

// browser supports standard CSS property name

supportedProp = prop;

} else {

// otherwise test support for vendor-prefixed property names

for ( var i = 0; i < prefixes.length; i++ ) {

vendorProp = prefixes[i] + capProp;

if ( vendorProp in div.style ) {

supportedProp = vendorProp;

break;

}

// avoid memory leak in IE

div = null;

// add property to $.support so it can be accessed elsewhere

$.support[ prop ] = supportedProp;

return supportedProp;

}

// call the function, e.g. testing for "border-radius" support:

styleSupport( "borderRadius" );

})(jQuery);