Discussion on jQuery's data api issue when the custom data attribute is a json format string_javascript skills

jQuery's data API implementation has the effect of caching data
Using IE 7 (IE8 switches to IE7 mode in the console), when the DOM node has custom data attributes, you can check the DOM node to see attributes in the shape of jQuery18305664906559272507 , which is the construction used to get custom data from the data storage object.

When the custom data attribute is a json format string, if the cached data is modified, the modified data will continue to exist in the cache system. If you are not careful, this may cause some BUG

< ;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"));//Get the value like this Not affected by caching
console.log(data3);