Questions about the use of get and post in Ajax

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Problems encountered when using get:

1. Question 1. Cache: When the url visited each time is the same, the client directly reads the content in the local cache. Even if the background data changes, the frontend will not change;

Solution: exist? Then link a num=[random number Math.random()] or num=[Timestampnew Date().getTime()], '1.php?username="May"&'+num (There is no variable name here to avoid conflict with background parameters)

2. Problem 2. Garbled characters. When Chinese or special characters are passed, garbled characters appear in the front-end display.

Solution: Use encoding encodeURI('snail')

Test result: By using Chrome test, the two problems of get result have been solved

Problems encountered when using post:

Post method, data is passed in send() as a parameter;

Problem: When the request header is not set, the background directly The data is not processed; the front desk cannot obtain the data returned by the background

Solution: Manually set the request header (xhr.setRequestHeader('content-type','application/x-www-form-urlencoded')) , declare the data type sent

[Note] There is no caching problem or encoding problem in the post (because it has been declared in the request header)

Test result: Passed Use Chrome to test, and the result is that the post does not declare header information. The problem exists.

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