html:
<text id='every' class="{{long}} {{isFold?'hide':'show'}}">{{listdata.content}}</text>
//给文本id class变量
JS:
var query = wx.createSelectorQuery();
query.select('#every').boundingClientRect(function(rect) {
wx.getSystemInfo({
success: function(res) {
let resHeight = (rect.height * (750 / res.windowWidth));//转换单位PX
console.log(resHeight)
if (resHeight > 200) {
that.setData({
long:"long-dec",
showlong: true
})
}
else{
that.setData({
long: "",
showlong: false
})
}
}
})
}).exec();