install way1: Download it on the official website and extract it to the plugin folder
（https://sourceforge.net/projects/npp-plugins/files/?source=navbar）
install way2: plugin --> plugin manager -->show plugin manager -->select from available (generally cannot be opened!)
some advicefrom http://www.oschina.net/news/27509/notepad-plugins-for-javascript-developers , which kind of plugin u want ，follow somePeople‘s advices and according to what u need as well
json Viewer ：
(1) Formatting: Select the json data in js, plugin-->JSON Viewer-->Format JSON
(2) Tree structure display: *********->Show JSON Viewer
Explorer : Browse function of directory structure, after successful installation, there will be a "magnifying glass" on the "menu bar"