javascript 阻止页面跳转 onbeforeunload


var warning = true;
window.onbeforeunload = function() {
  if (warning) {
    return 'You have made changes on this page that you have not yet confirmed. If you navigate away from this page you will loose your unsaved changes';

这段代码在Firefox下运行的结果与IE/Chrome有些不同,在FF下,我们return 的字符串不会被显示,FF会根据当前的用户浏览器语言弹出类似的对话框。

Chrome/FF/IE(IE9 控制台模拟IE7-8):

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