Jquery author JohnResig self-encapsulated javascript common function _ javascript skills

Jquery author JohnResig encapsulated common functions. For details, refer. The Code is as follows:

// Obtain the style value of an element.
Function getStyle (elem, name ){
If (elem. style [name]) {
Return elem. style [name];
} Else if (elem. currentStyle ){
Return elem. currentStyle [name];
} Else if (document. defaultView & document. defaultView. getComputedStyle ){
Name = name. replace (/([A-Z])/g, "-$1 ″);
Name = name. toLowerCase ();
Var s = document. defaultView. getComputedStyle (elem ,"");
Return s & s. getPropertyValue (name );
} Else {
Return null
}
}
// Obtain the x and y coordinates of the element relative to the page.
Function pageX (elem ){
Return elem. offsetParent? (Elem. offsetLeft + pageX (elem. offsetParent): elem. offsetLeft;
}
Function pageY (elem ){
Return elem. offsetParent? (Elem. offsetTop + pageY (elem. offsetParent): elem. offsetTop;
}
// Obtain the x and y coordinates of the element relative to the parent element.
Function parentX (elem ){
Return elem. parentNode = elem. offsetParent? Elem. offsetLeft: pageX (elem)-pageX (elem. parentNode );
}
Function parentY (elem ){
Return elem. parentNode = elem. offsetParent? Elem. offsetTop: pageY (elem)-pageY (elem. parentNode );
}
// Obtain the x and y coordinates of the elements located using css.
Function posX (elem ){
Return parseInt (getStyle (elem, "left "));
}
Function posY (elem ){
Return parseInt (getStyle (elem, "top "));
}
// Set the element position.
Function setX (elem, pos ){
Elem. style. left = pos + "px ";
}
Function setY (elem, pos ){
Elem. style. top = pos + "px ";
}
// Add the X and y coordinates of the elements.
Function addX (elem, pos ){
Set (elem, (posX (elem) + pos ));
}
Function addY (elem, pos ){
Set (elem, (posY (elem) + pos ));
}
// Obtain the height and width of the element controlled by css.
Function getHeight (elem ){
Return parseInt (getStyle (elem, "height "));
}
Function getWidth (elem ){
Return parseInt (getStyle (elem, "width "));
}
// Obtain the possible height and width of the element.
Function getFullHeight (elem ){
If (getStyle (elem, "display ")! = "None "){
Return getHeight (elem) | elem. offsetHeight;
} Else {
Var old = resetCss (elem, {display: "block", visibility: "hidden", position: "absolute "});
Var h = elem. clientHeight | getHeight (elem );
RestoreCss (elem, old );
Return h;
}
}
Function getFullWidth (elem ){
If (getStyle (elem, "display ")! = "None "){
Return getWidth (elem) | elem. offsetWidth;
} Else {
Var old = resetCss (elem, {display: "block", visibility: "hidden", position: "absolute "});
Var w = elem. clientWidth | getWidth (elem );
RestoreCss (elem, old );
Return w;
}
}
// Set css and save the old css
Function resetCss (elem, prop ){
Var old = {};
For (var I in prop ){
Old [I] = elem. style [I];
Elem. style [I] = prop [I];
}
Return old;
}
Function restoreCss (elem, prop ){
For (var I in prop ){
Elem. style [I] = prop [I];
}
}
// Display and hide
Function show (elem ){
Elem. style. display = elem. $ oldDisplay | "";
}
Function hide (elem ){
Var curDisplay = getStyle (elem, "display ");
If (curDisplay! = "None "){
Elem. $ oldDisplay = curDisplay;
Elem. style. display = "none ";
}
}
// Set transparency
Function setOpacity (elem, num ){
If (elem. filters ){
Elem. style. filter = "alpha (opacity =" + num + ")";
} Else {
Elem. style. opacity = num/100;
}
}
// Slide
Function slideDown (elem ){
Var h = getFullHeight (elem );
Elem. style. height = "0px ";
Show (elem );
For (var I = 0; I <= 100; I + = 5 ){
New function (){
Var pos = I;
SetTimeout (function () {elem. style. height = (pos/100 x h) + "px" ;}, (pos * 10 ));
}
}
}
// Gradient
Function fadeIn (elem ){
Show (elem );
SetOpacity (elem, 0 );
For (var I = 0; I <= 100; I + = 5 ){
New function (){
Var pos = I;
SetTimeout (function () {setOpacity (elem, pos) ;}, (pos + 1) * 10 );
}
}
}
// Obtain the cursor position relative to the entire page.
Function getX (e ){
E = e | window. event;
Return e. pageX | e. clientX + document. body. scrollLeft;
}
Function getY (e ){
E = e | window. event;
Return e. pageY | e. clientY + document. body. scrollTop;
}
// Obtain the cursor position relative to the current element.
Function getElementX (e ){
Return (e & e. layerX) | window. event. offsetX;
}
Function getElementY (e ){
Return (e & e. layerY) | window. event. offsetY;
}
// Obtain the page height and width
Function getPageHeight (){
Var demo-document.doc umentElement;
Return document. body. scrollHeight | (de & de. scrollHeight );
}
Function getPageWidth (){
Var demo-document.doc umentElement;
Return document. body. scrollWidth | (de & de. scrollWidth );
}
// Obtain the position of the scroll bar.
Function scrollX (){
Var demo-document.doc umentElement;
Return self. pageXOffset | (de & de. scrollLeft) | document. body. scrollLeft;
}
Function scrollY (){
Var demo-document.doc umentElement;
Return self. pageYOffset | (de & de. scrollTop) | document. body. scrollTop;
}
// Obtain the height and width of the view.
Function compute wheight (){
Var de = document.doc umentElement;
Return self. innerHeight | (de & de. offsetHeight) | document. body. offsetHeight;
}
Function compute wwidth (){
Var de = document.doc umentElement;
Return self. innerWidth | (de & de. offsetWidth) | document. body. offsetWidth;
}