A brief introduction to ajax
Oct 10, 2017 am 10:15 AM1.ajax native
ajax includes the following steps: 1. Create an AJAX object; 2. Issue an HTTP request; 3. Receive data returned by the server; 4. Update web page data. To summarize, in one sentence, ajax issues an HTTP request through the native XMLHttpRequest
object, and then processes the data returned by the server.
Steps:
1 2 3 4 5 |
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 |
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2.jquery encapsulates ajax
1 2 3 4 5 6 7 8 9 10 11 |
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3.jsonp cross-domain principle
For security reasons , the browser prohibits ajaxcross-domain data acquisition
Step by step demonstration ofscriptsrc Attribute loadingjsFile method to obtain data
Explain the mechanism of cross-domain data acquisition
(1) Dynamic creation scriptTag
(2)Define callback function
(3) Return function call
(4) Pass parameters or global variables
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