Vant problem record

van-list Initialize repeated requests for data twice

The reason is that it's possible that when the data doesn't come back load It is detected that the data is lower than the height , Also sent once , By the time the data came back, it had been requested twice .

Be careful :vant-ui The performance of browser and mobile terminal is inconsistent , See the final effect according to the specific business .

resolvent ：
1.offset Default 300, Set smaller
2. Do not let it initialize to check the scroll position

	:immediate-check='false' //  Whether to perform scroll position check immediately at initialization 

if :immediate-check='false' Don't take effect , Then use check()

	<van-list ref="list" />

	this.$refs.list.check();