Can't use injected jQuery

Question

I want to inject jQuery into a web page (with a content script) in a Chrome extension.

I try, but something confuses me.

here is my manifest.json

Answer 1

I used this and it's working fine. maybe the path of your jquery is not correct.

"content_scripts": [{
    "matches": ["http://*/*", "https://*/*"],
    "js": ["js/jquery.min.js", "js/socket/socket.io.js","js/socket/client.js"],
    "run_at": "document_idle"
}]