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veryblue/ページ離脱時にアラートを表示する.js

Created March 15, 2016 07:28
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ページ離脱時にアラートを表示する.js
window.addEventListener("beforeunload", function (e) {
var confirmationMessage = "入力内容を破棄します。";
e.returnValue = confirmationMessage;
return confirmationMessage;
});
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