js抄袭笔记 -
好处:1.考虑了resize
2.考虑了页面宽度不足一屏幕
3.考虑了滚动条
http://james.padolsey.com/page/2/
function documentOverlay() {
// @version 0.12
// @author James Padolsey
// @info http://james.padolsey.com/javascript/the-perfect-document-overlay/
// Shortcut to current instance of object:
var instance = this,
// Cached body height:
bodyHeight = (function(){
return getDocDim('Height','min');
})();
// CSS helper function:
function css(el,o) {
for (var i in o) { el.style = o; }
return el;
};
// Document height/width getter:
function getDocDim(prop,m){
m = m || 'max';
return Math(
Math(document.body["scroll" + prop], document.documentElement["scroll" + prop]),
Math(document.body["offset" + prop], document.documentElement["offset" + prop]),
Math(document.body["client" + prop], document.documentElement["client" + prop])
);
}
// get window height: (viewport):
function getWinHeight() {
return window.innerHeight ||
(document.compatMode == "CSS1Compat" && document.documentElement.clientHeight || document.body.clientHeight);
}
// Public properties:
// Expose CSS helper, for public usage:
this.css = function(o){
css(instance.element, o);
return instance;
};
// The default duration is infinity:
this.duration = null;
// Creates and styles new div element:
this.element = (function(){
return css(document.createElement('div'),{
width: '100%',
height: getDocDim('Height') + 'px',
position: 'absolute', zIndex: 999,
left: 0, top: 0,
});
})();
// Resize cover when window is resized:
window.onresize = function(){
// No need to do anything if document['body'] is taller than viewport
if(bodyHeight>getWinHeight()) { return; }
// We need to hide it before showing
// it again, due to scrollbar issue.
instance.css({display: 'none'});
setTimeout(function(){
instance.css({
height: getDocDim('Height') + 'px',
display: 'block'
});
}, 10);
};
// Remove the element:
this.remove = function(){
this.element.parentNode && this.element.parentNode.removeChild(instance.element);
};
// Show element:
this.show = function(){};
// Event handling helper:
this.on = function(what,handler){
what.toLowerCase() === 'show' ? (instance.show = handler)
: instance.element['on'+what] = handler;
return instance;
};
// Begin:
this.init = function(duration){
// Overwrite duration if parameter is supplied:
instance.duration = duration || instance.duration;
// Inject overlay element into DOM:
document.getElementsByTagName('body').appendChild(instance.element);
// Run show() (by default, an empty function):
instance.show.call(instance.element,instance);
// If a duration is supplied then remove element after
// the specified amount of time:
instance.duration && setTimeout(function(){instance.remove();}, instance.duration);
// Return instance, for reference:
return instance;
};
}
var Mao = (new documentOverlay()).css({
background: 'black',
opacity: 0.5,
filter: 'alpha(opacity=50)'
}).on('dblclick',function(){
Mao.remove()
}).init();
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