常用的全屏居中 JS 函数

//获取元素
function getElement(ele) {
return document.getElementById(ele);
}
//自动居中函数
function autoCenter(el) {
var bodyX = document.documentElement.offsetWidth || document.body.offsetWidth;
var bodyY =
document.documentElement.offsetHeight || document.body.offsetHeight;

var elementX = el.offsetWidth;
var elementY = el.offsetHeight;

el.style.left = (bodyX - elementX) / 2 + "px";
el.style.top = (bodyY - elementY) / 2 + "px";
}