有bug，过滤数据的时候，显示有数据，没有返回节点 #119
Description
调试如下
filter (h) {
let delta = this.delta
const slots = this.$slots.default || []
console.log(delta)
// item-mode shoud judge from items prop.
if (this.item) {
delta.total = this.itemcount
if (delta.keeps > delta.total) {
delta.end = delta.total - 1
}
} else {
if (!slots.length) {
delta.start = 0
}
delta.total = slots.length
}
let paddingTop, paddingBottom, allHeight
const hasPadding = delta.total > delta.keeps
if (this.variable) {
allHeight = this.getVarAllHeight()
paddingTop = hasPadding ? this.getVarPaddingTop() : 0
paddingBottom = hasPadding ? this.getVarPaddingBottom() : 0
} else {
allHeight = this.size * delta.total
paddingTop = this.size * (hasPadding ? delta.start : 0)
paddingBottom = this.size * (hasPadding ? delta.total - delta.keeps : 0) - paddingTop
}
if (paddingBottom < this.size) {
paddingBottom = 0
}
delta.paddingTop = paddingTop
delta.paddingBottom = paddingBottom
delta.offsetAll = allHeight - this.size * this.remain
let renders = []
console.log(delta.start, delta.total, delta.end) // 此处打印数据
for (let i = delta.start; i < delta.total && i <= Math.ceil(delta.end); i++) {
let slot = null
if (this.item) {
slot = h(this.item, this.itemprops(i))
} else {
slot = slots[i]
}
renders.push(slot)
}
console.log(renders)
return renders
}