https://moroyama-kanko.jp/js/jquery/jquery.metadata.js

1/* jquery.metadata.2.1.js */
2(function (e) {
3	e.extend(
4		{ metadata: {
5			defaults: {
6				type: "class",
7				name: "metadata",
8				cre: /({.*})/,
9				single: "metadata",
10				unescape: true
11			},
12			setType: function (b, a) {
13				this.defaults.type = b;
14				this.defaults.name = a;
15			},
16			get: function (b, a) {
17				a = e.extend({}, this.defaults, a);
18				if (!a.single.length)
19					a.single = "metadata";
20				var c = e.data(b, a.single);
21				if (c)
22					return c;
23				c = "{}";
24				var h = function (d) {
25					if (typeof d != "string")
26						return d;
27					return d = eval("(" + d + ")");
28				};
29				if (a.type == "html5") {
30					var g = {};
31					e(b.attributes).each(function () {
32						var d = this.nodeName;
33						if (d.match(/^data-/))
34							d = d.replace(/^data-/, "");
35						else return true;
36						g[d] = h(this.nodeValue);
37					});
38				} else {
39					if (a.type == "class") {
40						var f = a.cre.exec(b.className);
41						if (f)
42							c = f[1];
43						if (a.unescape)
44							c = c.replace(/%20/g, " ");
45					} else if (a.type == "elem") {
46						if (!b.getElementsByTagName)
47							return;
48						f = b.getElementsByTagName(a.name);
49						if (f.length)
50							c = e.trim(f[0].innerHTML);
51					} else if (b.getAttribute != undefined)
52						if (f = b.getAttribute(a.name))
53							c = f;
54					g = h(c.indexOf("{") < 0 ? "{" + c + "}" : c);
55				}
56				e.data(b, a.single, g);
57				return g;
58			}
59		}
60		});
61	e.fn.metadata = function (b) {
62		return e.metadata.get(this[0], b);
63	}
64})(jQuery);