WXML 节点信息
所有 API 函数如下：
/** return a SelectorQuery instance */
var query = wx.createSelectorQuery()
query.select('#the-id').boundingClientRect()
query.selectViewport().scrollOffset()
query.exec(function(res) {
res[0].top // the top border location
res[1].scrollTop // viewport's vertical scroll section
})
SelectorQuery 对象的方法列表：
lib 1.6+
/** return component query */
selectorQuery.in(component)
/** return a NodesRef instance, return only the first matched node */
selectorQuery.select(selector)
/** return all the matched nodes */
selectorQuery.selectAll(selector)
/** return a NodesRef instance about current viewport */
selectorQuery.selectViewport()
/** get bounding box */
nodesRef.boundingClientRect(callback)
wx.createSelectorQuery().select('#the-id').boundingClientRect(function(rect){
rect.id,
rect.dataset,
rect.left,
rect.right,
rect.top,
rect.bottom,
rect.width,
rect.height
})
nodesRef.scrollOffset(callback)
wx.createSelectorQuery().selectViewport().scrollOffset(function(res){
res.id,
res.dataset,
res.scrollLeft,
res.scrollTop
}).exec()
nodesRef.fields(fields, callback)
wx.createSelectorQuery().select('#the-id').fields({
dataset: true,
size: true,
scrollOffset: true,
properties: ['scrollX', 'scrollY']
}, function(res) {
res.dataset,
res.width,
res.height,
res.scrollLeft,
res.scrollTop,
res.scrollX,
res.scrollY
}).exec()
selectorQuery.exec(callback)
selector 支持的语法包括：
#the-id.a-class.another-class.the-parent > .the-child.the-ancestor .the-descendant.the-ancestor >>> .the-descendant#a-node, .some-other-nodes