使用jQuery在iFrame中防止F5

// 获取iframe元素
var iframe = document.getElementById("my-iframe");

// 获取iframe的文档对象
var iframeDoc = iframe.contentWindow.document;

// 定义iframe的边框
var iframeBorder = "1px solid #ddd";

// 获取iframe的尺寸
var iframeWidth = iframe.offsetWidth;
var iframeHeight = iframe.offsetHeight;

// 创建一个div元素，用于覆盖iframe的整个视口
var overlay = iframeDoc.createElement("div");
overlay.style.width = iframeWidth + "px";
overlay.style.height = iframeHeight + "px";
overlay.style.position = "fixed";
overlay.style.top = 0;
overlay.style.left = 0;
overlay.style.zIndex = 99999;
overlay.style.border = iframeBorder;
iframeDoc.body.appendChild(overlay);

// 创建一个iFrame的副本，并隐藏副本
var iframeClone = iframeDoc.createElement("iframe");
iframeClone.src = "about:blank";
iframeClone.style.display = "none";
iframeClone.style.position = "absolute";
iframeClone.style.top = iframeHeight + "px";
iframeClone.style.left = iframeWidth + "px";
iframeClone.style.zIndex = 99999;
iframeClone.style.border = iframeBorder;
iframeDoc.body.appendChild(iframeClone);

// 移除iframe元素，防止页面刷新
setTimeout(function() {
    iframe.remove();
}, 100);