恩 記錄代碼中覺得寫的比較有意思的代碼片段
第一個來自clean:方法
用正則取標籤
if ( typeof elem === "string" ) {
elem = elem.replace(/(<(/w+)[^>]*?)//>/g, function(all, front, tag){
return tag.match(/^(abbr|br|col|img|input|link|meta|param|hr|area|embed)$/i) ?
all :
front + "></" + tag + ">";
});
});
如果字符串是按<xxx/>這中格式來的話
replace就會進行 不然不會進行replace
如'<div><span></span></div>'則不進行替換 最後還是返回本身
如果是<div/>則進行替換
function中
all代表 整個字符串
front代表除去結尾部分/>的字符串
tag代表標籤名
tag.match(/^(abbr|br|col|img|input|link|meta|param|hr|area|embed)$/i)
可以看到裏面所有的但是單標籤
所以返回all 就是整個字符串
剩下的雙標籤的就返回 front + "></" + tag + ">"
爲什麼不寫成"<"+tag++ "></" + tag + ">"
因爲有可能標籤是帶有屬性的
如<div style='width:50px'/>
這樣 front 就可以匹配到<div style='width:50px'
所以能夠把屬性也返回了
爲了方便寫成函數的形式方便調用
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd
">
<html
xmlns="http://www.w3.org/1999/xhtml
">
<head>
<meta
http-equiv="Content-Type" content="text/html; charset=gb2312"
/>
<title></title>
</head>
<body >
<div
id='ss'>vivivivivivivivivivi</div>
</body>
<script
type="text/javascript">
(function(){
var window =
this,
jQuery = window.jQuery = window.$ = function( selector,
context ) {
return new jQuery.fn.init( selector, context
);
},
quickExpr =
/^[^<]*(<(.|/s)+>)[^>]*$|^#([/w-]+)$/,
isSimple =
/^.[^:#/[/.,]*$/;
//------------------------------------------jq擴展函數開始--------------------------------
jQuery.extend = function() {
var target =
arguments[0] || {}, i = 1, length = arguments.length, deep = false,
options;
if ( typeof target === "boolean" )
{
deep = target;
target = arguments[1] || {};
i =
2;
}
if ( typeof target
!== "object" && !jQuery.isFunction(target)
)
target = {};
if ( length == i ) {
target =
this;
--i;
}
for ( ; i < length; i++
)
if ( (options = arguments[ i ]) != null
)
for ( var name in options )
{
var src = target[ name ],
copy = options[ name ];
if (
target === copy )
continue;
if ( deep &&
copy && typeof copy === "object" && !copy.nodeType
)
target[ name ] =
jQuery.extend( deep,
src || (
copy.length != null ? [ ] : { }
)
, copy
);
else if ( copy !==
undefined )
target[
name ] = copy;
}
return target;
};
//------------------------------------------jq擴展函數結束--------------------------------
//------------------------------------------jq類開始--------------------------------
jQuery.fn = jQuery.prototype = {
init :
function( selector, context ){
selector =
selector || document;
if ( selector.nodeType )
{
this[0] =
selector;
this.length =
1;
this.context =
selector;
return
this;
};
if (
typeof selector === "string" ) {
var
match = quickExpr.exec( selector );
if (
match && (match[1] || !context) )
{
if(match[1]){
selector = jQuery.clean( [ match[1] ], context
);
}else{
var elem =
document.getElementById( match[3]
);
//ie6下
/*if ( elem
&& elem.id != match[3]
)
return
jQuery().find( selector
);*/
var ret =
jQuery( elem || [] );
ret.context =
document;
ret.selector =
selector;
return
ret;
};
}
}
return
this.setArray(jQuery.isArray( selector )?selector
:jQuery.makeArray(selector));
},
setArray: function( elems )
{
this.length = 0;
Array.prototype.push.apply( this, elems );
return this;
}
}
jQuery.fn.init.prototype = jQuery.fn;
//------------------------------------------jq類結束--------------------------------
//------------------------------------------jq方法擴展開始---------------------------------------
var
exclude = /z-?index|font-?weight|opacity|zoom|line-?height/i,
defaultView = document.defaultView || {},
toString =
Object.prototype.toString;
jQuery.extend({
clean: function( elems,
context, fragment ) {
context = context ||
document;
if ( typeof
context.createElement === "undefined" )
context = context.ownerDocument || context[0] &&
context[0].ownerDocument || document;
var ret = [], scripts = [], div =
context.createElement("div");
jQuery.each(elems, function(i,
elem){
if ( typeof elem === "number"
)
elem += '';
if ( !elem
)
return;
if ( typeof elem === "string" )
{
elem =
elem.replace(/(<(/w+)[^>]*?)//>/g, function(all, front,
tag){
return
tag.match(/^(abbr|br|col|img|input|link|meta|param|hr|area|embed)$/i)
?
all
:
front +
"></" + tag + ">";
});
var tags = elem.replace(/^/s+/, "").substring(0, 10).toLowerCase();
var wrap
=
!tags.indexOf("<opt")
&&
[ 1,
"<select multiple='multiple'>", "</select>" ] ||
!tags.indexOf("<leg")
&&
[ 1,
"<fieldset>", "</fieldset>" ] ||
tags.match(/^<(thead|tbody|tfoot|colg|cap)/)
&&
[ 1,
"<table>", "</table>" ] ||
!tags.indexOf("<tr")
&&
[ 2,
"<table><tbody>", "</tbody></table>" ] ||
// <thead>
matched above
(!tags.indexOf("<td") || !tags.indexOf("<th"))
&&
[ 3,
"<table><tbody><tr>",
"</tr></tbody></table>" ] ||
!tags.indexOf("<col")
&&
[ 2,
"<table><tbody></tbody><colgroup>",
"</colgroup></table>" ] ||
!jQuery.support.htmlSerialize &&
//!jQuery.support.htmlSerialize表示在ie瀏覽器下
[ 1, "div<div>", "</div>" ] ||
[ 0, "", ""
];
div.innerHTML = wrap[1] +
elem + wrap[2];
while ( wrap[0]--
)
div =
div.lastChild; //找到正確的父元素
//在ie6下
會執行下面的代碼
//去掉table中的
tbody標籤
if (
!jQuery.support.tbody ) {
// String was a
<table>, *may* have spurious
<tbody>
var
hasBody =
/<tbody/i.test(elem),
tbody = !tags.indexOf("<table") && !hasBody
?
div.firstChild && div.firstChild.childNodes :
// String
was a bare <thead> or
<tfoot>
wrap[1] == "<table>" && !hasBody
?
div.childNodes
:
[];
for
( var j = tbody.length - 1; j >= 0 ; --j
)
if (
jQuery.nodeName( tbody[ j ], "tbody" ) && !tbody[ j ].childNodes.length
)
tbody[ j ].parentNode.removeChild( tbody[ j ] );
}
if (
!jQuery.support.leadingWhitespace && /^/s/.test( elem )
)
div.insertBefore(
context.createTextNode( elem.match(/^/s*/)[0] ), div.firstChild
);
elem = jQuery.makeArray(
div.childNodes );
}
if ( elem.nodeType
)
ret.push( elem
);
else
ret = jQuery.merge( ret,
elem );
});
return
ret;
},
each: function( object,
callback, args ) {
var name, i = 0, length =
object.length;
if ( args )
{
if ( length === undefined )
{
for ( name in object
)
if (
callback.apply( object[ name ], args ) === false
)
break;
}
else
for ( ; i < length;
)
if (
callback.apply( object[ i++ ], args ) === false
)
break;
} else {
if ( length === undefined ) {
for ( name in object
)
if ( callback.call(
object[ name ], name, object[ name ] ) === false
)
break;
}
else
for ( var value =
object[0];
i <
length && callback.call( value, i, value ) !== false; value =
object[++i] ){}
}
return object;
},
makeArray:
function( array ) {
var ret =
[];
if( array != null
){
var i =
array.length;
if( i == null || typeof
array === "string" || jQuery.isFunction(array) || array.setInterval
)
ret[0] =
array;
else
while( i
)
ret[--i] =
array[i];
}
return ret;
},
isFunction: function( obj )
{
return toString.call(obj) === "[object
Function]";
},
isArray:
function(obj){
return toString.call(obj) ===
"[object Array]";
},
merge:
function( first, second ) {
var i = 0, elem, pos
= first.length;
if ( !jQuery.support.getAll )
{
while ( (elem = second[ i++ ]) != null
)
if ( elem.nodeType != 8
)
first[ pos++ ] =
elem;
}
else
while ( (elem = second[ i++ ]) !=
null )
first[ pos++ ] =
elem;
return first;
},
});
//------------------------------------------jq方法擴展結束---------------------------------------
(function(){
jQuery.support =
{};
var div =
document.createElement("div");
div.style.display =
"none";
div.innerHTML = '
<link/><table></table><a href="/a"
style="color:red;float:left;opacity:.5;">a</a><select><option>text</option></select><object><param/></object>';
var all =
div.getElementsByTagName("*"),
a =
div.getElementsByTagName("a")[0];
if ( !all
|| !all.length || !a ) {
return;
}
jQuery.support = {
// IE strips leading
whitespace when .innerHTML is used
leadingWhitespace: div.firstChild.nodeType == 3,
// Make sure that tbody elements aren't
automatically inserted
// IE will insert them
into empty tables
tbody:
!div.getElementsByTagName("tbody").length,
// Make sure that you can get all elements in an
<object> element
// IE 7 always returns no
results
objectAll:
!!div.getElementsByTagName("object")[0]
.getElementsByTagName("*").length,
// Make sure that link elements get serialized
correctly by innerHTML
// This requires a wrapper
element in IE
htmlSerialize:
!!div.getElementsByTagName("link").length,
// Get the style information from
getAttribute
// (IE uses .cssText
insted)
style: /red/.test(
a.getAttribute("style") ),
// Make sure that URLs aren't
manipulated
// (IE normalizes it by
default)
hrefNormalized: a.getAttribute("href")
=== "/a",
// Make
sure that element opacity exists
// (IE uses
filter instead)
opacity: a.style.opacity ===
"0.5",
// Verify
style float existence
// (IE uses styleFloat
instead of cssFloat)
cssFloat:
!!a.style.cssFloat,
// Will be
defined later
scriptEval:
false,
noCloneEvent:
true,
boxModel: null
};
})();
})();
alert($('#ss')[0].innerHTML);
</script>
</html>
