jQuery 中關於CSS操作部分使用說明

剛剛看了下jQuery的原始碼，其中關於CSS及className的操作思想確實很不錯，值得借鑒。
其中關於jQuery.className.has的定義部分，是用的正則來實現的，其實此處直接利用Javascript中String對象的indexOf方法來作處理的話，比用正則效率會更些，因此 複製代碼 代碼如下:jQuery.className.has的定義可以改進成：
has: function( t, c ) {
t = t.className || t;
t = " " + t + " ";
c = " " + c + " ";
return t.indexOf(c)>-1;
}

原代碼中關於CSS及className的操作部分節選如下： 複製代碼 代碼如下: className: {
// internal only, use addClass("class")
add: function( elem, c ){
jQuery.each( c.split(/\s+/), function(i, cur){
if ( !jQuery.className.has( elem.className, cur ) )
elem.className += ( elem.className ? " " : "" ) + cur;
});
},

// internal only, use removeClass("class")
remove: function( elem, c ){
elem.className = c ?
jQuery.grep( elem.className.split(/\s+/), function(cur){
return !jQuery.className.has( c, cur );
}).join(" ") : "";
},

// internal only, use is(".class")
has: function( t, c ) {
t = t.className || t;
// escape regex characters
c = c.replace(/([\.\\\+\*\?\[\^\]\$\(\)\{\}\=\!\<\>\|\:])/g, "\\$1");
return t && new RegExp("(^|\\s)" + c + "(\\s|$)").test( t );
}
},
swap: function(e,o,f) {
for ( var i in o ) {
e.style["old"+i] = e.style[i];
e.style[i] = o[i];
}
f.apply( e, [] );
for ( var i in o )
e.style[i] = e.style["old"+i];
},

css: function(e,p) {
if ( p == "height" || p == "width" ) {
var old = {}, oHeight, oWidth, d = ["Top","Bottom","Right","Left"];

jQuery.each( d, function(){
old["padding" + this] = 0;
old["border" + this + "Width"] = 0;
});

jQuery.swap( e, old, function() {
if (jQuery.css(e,"display") != "none") {
oHeight = e.offsetHeight;
oWidth = e.offsetWidth;
} else {
e = jQuery(e.cloneNode(true))
.find(":radio").removeAttr("checked").end()
.css({
visibility: "hidden", position: "absolute", display: "block", right: "0", left: "0"
}).appendTo(e.parentNode)[0];

var parPos = jQuery.css(e.parentNode,"position");
if ( parPos == "" || parPos == "static" )
e.parentNode.style.position = "relative";

oHeight = e.clientHeight;
oWidth = e.clientWidth;

if ( parPos == "" || parPos == "static" )
e.parentNode.style.position = "static";

e.parentNode.removeChild(e);
}
});

return p == "height" ? oHeight : oWidth;
}

return jQuery.curCSS( e, p );
},

curCSS: function(elem, prop, force) {
var ret;

if (prop == "opacity" && jQuery.browser.msie)
return jQuery.attr(elem.style, "opacity");

if (prop == "float" || prop == "cssFloat")
prop = jQuery.browser.msie ? "styleFloat" : "cssFloat";

if (!force && elem.style[prop])
ret = elem.style[prop];

else if (document.defaultView && document.defaultView.getComputedStyle) {

if (prop == "cssFloat" || prop == "styleFloat")
prop = "float";

prop = prop.replace(/([A-Z])/g,"-$1").toLowerCase();
var cur = document.defaultView.getComputedStyle(elem, null);

if ( cur )
ret = cur.getPropertyValue(prop);
else if ( prop == "display" )
ret = "none";
else
jQuery.swap(elem, { display: "block" }, function() {
var c = document.defaultView.getComputedStyle(this, "");
ret = c && c.getPropertyValue(prop) || "";
});

} else if (elem.currentStyle) {

var newProp = prop.replace(/\-(\w)/g,function(m,c){return c.toUpperCase();});
ret = elem.currentStyle[prop] || elem.currentStyle[newProp];

}

return ret;
},

附錄：
jQuery官方網站：http://jquery.com/
jQuery源碼下載：http://docs.jquery.com/Downloading_jQuery
jQuery API文檔：http://docs.jquery.com/Main_Page
jQuery 中國：http://jquery.org.cn/
VisualJQuery.com : http://visualjquery.com/