function getOffset(el) {
var $el = $(el)
var offset
if ($.isWindow(el)) {
// window use scroll
offset = {
top: $el.scrollTop(),
left: $el.scrollLeft()
}
} else {
offset = $el.offset()
}
return _.extend(offset, {
height: $el.innerHeight(),
width: $el.innerWidth()
})
}
exports.add = function() {
var args = arguments
var opt = addReopt.get(args)
if (!opt) return debug('unknown args', args)
opt = _.extend({}, exports.absent, opt, opt.opt)
var $el = $(opt.el)
if (!opt.scrollOut && false !== opt.once) {
// also once
opt.once = true
}
if (0 == arr.length && $el.length) {
exports.init()
}
_.each($el, function(el) {
$(el).data(optName, _.only(opt, 'scrollIn scrollOut className once isInView'))
arr.push(el)
check(el)
})
}