a picture lazy loader via promise
var picList = [
{
id: 'a001',
src: 'https://pbs.twimg.com/media/CyMQcQ3VIAA-Bb8.jpg'
},
{
id: 'a002',
src: 'https://avatars1.githubusercontent.com/u/19837987?v=4&s=400'
},
{
id: 'a003',
src: 'https://pbs.twimg.com/profile_images/802137634650763265/NT-UMMTV.jpg'
},
{
id: 'a004',
src: 'https://avatars0.githubusercontent.com/u/6823863?v=4&s=400'
}
]
// 每组(趟)加载多少个
var limit = 2
// 每组(趟)超时,单位毫秒
var timeout = 5000
var lazy = initLazy(picList, limit, timeout)
lazy.run()