Custom component life cycle res.height sometimes reports to null
ready: function () {
var that = this
var query = wx.createSelectorQuery().in(this)
query.select(".question").boundingClientRect(function (res) {
that.setData({
questionHeight: res.height
})
}).exec()
// console.log(that.data.questionHeight)}
may be a loading lifecycle problem.
try writing under onShow ()
your console.log must be written into the callback function, otherwise console will be executed before boundingClientRect triggers the callback and setData.
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