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Sample to describe how to use `onbeforeunload` without `event` parameter in `zone.js`
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="./zone.js"></script> | |
| <script> | |
| const desc = Object.getOwnPropertyDescriptor(window, 'onbeforeunload'); | |
| if (desc) { | |
| const oriGet = desc.get; | |
| const oriSet = desc.set; | |
| const preDefinedEvent = document.createEvent('Event'); | |
| preDefinedEvent.initEvent('beforeunload', false, true); | |
| Object.defineProperty(window, 'onbeforeunload', { | |
| configurable: true, | |
| get: function () { | |
| const wrapFn = oriGet.apply(this, arguments); | |
| if (wrapFn) { | |
| return function() { | |
| const args = Array.prototype.slice.call(arguments); | |
| let evt = args.length === 0 ? preDefinedEvent : args[0]; | |
| return wrapFn.apply(this, [evt]); | |
| } | |
| } | |
| return wrapFn; | |
| } | |
| }); | |
| } | |
| } | |
| window.onbeforeunload = function() { | |
| console.log('test', arguments[0]); | |
| } | |
| window.onbeforeunload(); | |
| </script> | |
| </head> | |
| <body> | |
| <button type="button" id="btn">btn</button> | |
| </body> | |
| </html>> |
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