javascript 自定義錯誤處理

php 中是可以自定義程式的錯誤和異常處理函數的（handler）.于是，我在想，javascript 中是否也存在和PHP中一樣的異常和錯誤處理函數呢？

try{}catch(){} 這種捕捉異常和錯誤的機制，我們很熟悉，當然這在javascript 中也是支援的。那麼，javascript 中有類似php中的魔術方法嗎？來定義

異常和錯誤的handler()????

于是，google之，找到了下面的這篇文章，确實可以：）！！！！！！

參考： http://www.javascripter.net/faq/err_demo.htm?customHandler

Error Handling Demo  Contents | JavaScript FAQ | Error Handling Question: Can I dynamically change the JavaScript error handler? Answer: Yes. To change the JavaScript error handler, just set window.onerror  to the name of the function that will serve as your new error handler. Here's a demo that lets you test three different error handlers: the browser's default error handler an error handler that displays a customized alert box a "silent" error handler that suppresses all error messages.  Custom Error Handler Silent Error Handler Default Error Handler   Use the select box to set or change the error handler. Click Fire an Error to test the active error handler. Below is the source code of the error handling functions used in this demo: function defaultHandler() {return false} function silentHandler() {return true} function customHandler(desc,page,line,chr) { alert( 'JavaScript error occurred! \n' +'The error was handled by ' +'a customized error handler.\n' +'\nError description: \t'+desc +'\nPage address: \t'+page +'\nLine number: \t'+line ) return true }