A
Size: a a a
A
PM
A
A
PM
A
PM
PM
PM
use:intobserver={{ threshold: 2.0, }}
A
use:intobserver={{ threshold: 2.0, }}
AP
PM
PM
A
A
target = [].map.call(
node.querySelectorAll(selector),
target => {
observer.observe(target);
return target;
}
PM
A
PM
PM
PM