20 min 2 Questions simple answer, kneel

1, describe the mechanism of memory warning, and list what the app should do to respond to memory warning.

2, XSS as the Web front-end common injection vulnerability, in today's internet business is no less dangerous than other means of attack. Please refer to the following scenario to write the appropriate filter function.
(1) After getting the JSON data asynchronously, it is safe to use interhtml display on the page.
(2) The browser address bar directly get parameters, how to safely document.write
(3) The background directly output the full HTML page, how to ensure that the page rendering, the user content of the "script" is not executed.

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20 min 2 Questions simple answer, kneel