源码：
1.demo.jsp
2.myAlert.js
提示窗口
* @param title 提示标题，默认为""
* @param content 提示内容,默认为""
* @param closeTime 提示窗口自动关闭时间，单位为ms，默认为2000ms
*/
MyAlert.prototype.alert = function (title,content,closeTime) {
var div_background = document.createElement("div");
div_background.style.position = "absolute";
div_background.style.left = "0";
div_background.style.top = "0";
div_background.style.width = "100%";
div_background.style.height = "100%";
div_background.style.backgroundColor = "rgba(0,0.1)";
div_background.style.zIndex = "1001";
var div_alert = document.createElement("div");
div_alert.style.position = "absolute";
div_alert.style.left = "40%";
div_alert.style.top = "0";
div_alert.style.width = "20%";
div_alert.style.height = "20%";
div_alert.style.overflow = "auto";
div_alert.style.backgroundColor = "rgba(255,255,0.5)";
div_alert.style.zIndex = "1002";
div_alert.style.border = "1px solid blue";
div_alert.style.borderRadius = "10px";
div_alert.style.BoxShadow = "0 0 10px gray";
var div_title = document.createElement("div");
div_title.style.backgroundColor = "rgba(0,0.3)";
div_title.style.textAlign = "center";
var span_title = document.createElement("span");
span_title.style.fontSize = "20px";
span_title.style.fontWeight = "bold";
var text_title = document.createTextNode((title === undefined || title === null) ? "" : title) ;
span_title.appendChild(text_title);
div_title.appendChild(span_title);
div_alert.appendChild(div_title);
var div_content = document.createElement("div");
div_content.style.lineHeight = "35px";
div_content.style.paddingLeft = "10px";
var span_content = document.createElement("span");
var text_content = document.createTextNode((content === undefined || content === null) ? "" : content);
span_content.appendChild(text_content);
div_content.appendChild(span_content);
div_alert.appendChild(div_content);
document.body.appendChild(div_background);
document.body.appendChild(div_alert);
setTimeout(function () {
document.body.removeChild(div_alert);
document.body.removeChild(div_background);
},(closeTime === undefined || closeTime === null || closeTime === "") ? 2000 : closeTime);
};
原文链接：https://www.f2er.com/js/38467.html