1.jquery 獲取元素絕對位置
var left = $("#id").position().left;
2.js獲取元素絕對位置
var left = document.getElementById("id").getBoundingClientRect().left;
https://developer.mozilla.org/zh-CN/docs/Web/API/Element/getBoundingClientRect
var left = $("#id").position().left;
var left = document.getElementById("id").getBoundingClientRect().left;
https://developer.mozilla.org/zh-CN/docs/Web/API/Element/getBoundingClientRect