onReady(){ let that = this uni.getSystemInfo({ success: function(res) { // res - 各種參數 console.log(res.windowHeight); // 屏幕的寬度 let info = uni.createSelectorQuery().select(".hander");// 獲取某個元素 info.boundingClientRect(function(data) { //data - 各種參數 console.log(data.height) // 獲取元素寬度 let view = res.windowHeight - data.height that.heightHome = view }).exec() } }); },