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JQuery's data API implementation method has the effect of caching data
Use IE 7 (IE8 + switch to IE7 mode on the console). When a DOM node has custom data attributes, check the DOM node to see attributes such as jQuery18305664906559272507, this is used to obtain custom data from a data storage object.
When the custom data attribute is a json string, if the cached data is modified, the modified data continues to exist in the cache system. If you do not pay attention to it, this may cause some bugs.
Copy codeThe Code is as follows:
<! Doctype html>
<Html>
<Head>
<Script src = "http://code.jquery.com/jquery-1.8.3.js"> </script>
</Head>
<Body>
<Input type = "hidden" value = "" data-json = '{"a": 123, "B": 456}' id = "tst"/>
<Script>
Var node = $ ("# tst ");
Console. log (node. attr ("data-json "));
Var data = node. data ("json ");
Console. log (data );
Data. B = 'hello ';
Var data1 = JSON. parse (node. attr ("data-json "));
Console. log (data1 );
Console. log ('data = data1', data = data1 );
Var data2 = node. data ("json ");
Console. log (data2 );
Console. log ('data = data2 ', data = data2 );
Var data3 = JSON. parse (node. attr ("data-json"); // This value is not affected by the cache.
Console. log (data3 );
</Script>
</Body>
</Html>
Running result
Copy codeThe Code is as follows:
{"A": 123, "B": 456}
Object {a: 123, B: 456}
Object {a: 123, B: 456}
Data = data1 false
Object {a: 123, B: "hello "}
Data === data2 true
Object {a: 123, B: 456}
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