關鍵部分用粗黑體。
function goodbye(e) {if(!e) e = window.event;//e.cancelBubble is supported by IE - this will kill the bubbling process.e.cancelBubble = true;e.returnValue = 'You sure you want to leave?'; //This is displayed on the dialog//e.stopPropagation works in Firefox.if (e.stopPropagation) {e.stopPropagation();e.preventDefault();} } window.onbeforeunload=goodbye;

轉載于:https://www.cnblogs.com/dhuhank/p/4689902.html

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