2017/09/29弹出层

var mask = document.getElementsByClassName("mask")[0];
var out = document.getElementsByClassName("out")[0];
var btn1 = document.getElementById("btn1");
var c_height = document.documentElement.clientHeight;
var c_width = document.documentElement.clientWidth;
var top_ = c_height / 2 -200;
var left = c_width / 2 - 300;

mask.style.height = c_height + "px";
out.style.top = top_ + "px";
out.style.left = left + "px";

btn1.onclick = function() {
mask.removeAttribute("hidden");
out.removeAttribute("hidden");
}
mask.onclick = function() {
mask.setAttribute("hidden", "hidden");
out.setAttribute("hidden", "hidden");
}

window.onresize = function() {
var c_height = document.documentElement.clientHeight;
var c_width = document.documentElement.clientWidth;
var top_ = c_height / 2 - 200;
var left = c_width / 2 - 300;

mask.style.height = c_height + "px";
out.style.top = top_ + "px";
out.style.left = left + "px";
}

swal(
‘1‘,
‘2‘,
‘success‘
)

2017/09/29弹出层

原文：http://www.cnblogs.com/buzhiheyan/p/7613239.html