相对坐标
var i=document.getElementById("kk")
var x=i.offsetLeft
var y=i.offsetTop
绝对坐标
var buff=document.getElementById("Editor")//此ID要设position:absolute
var pass=document.getElementById("kg").getBoundingClientRect()
buff.style.left=pass.left+"px"
buff.style.top=pass.top+"px"