No ke aha la e mākou pono, a pehea e palapala JQuery-selector?

Hoikehonua, pūnaewele akamai e ole wale ke kumu o ka hoʻokumu paʻaʻana o ka HTML, ka CSS a me ka pio, akā, no hoi e hiki ke hana i loko o ka hale waihona puke JQuery, a e kālele ana ma luna o ka AaOIeIOUIeXAOAaIN o pio me ka HTML-palapala. I ka mea e leie aku ka wikiwiki komo i kekahi hehee ai nā haʻawina (noi iaaiey mau 'mea e hoʻolako komo i ka maʻiʻo mana html-AEIU) a manipulate ia. I ka papa kuhikuhiE mall huahelu o ka waihona i ke kime. I mea e pili i kekahi 'ole ka' ē aʻe hui, e pono i ka JQuery-selector.

Haʻilula Mahouka ma JQuery waihona

Nā Mahouka ma JQuery nānā 'ana i hoʻohana ma CSS. Ka mea i koi 'ia e koho i ikamu HTML-AEI, e hana ia i ka i kēia mau' ole 'ē aʻe ano o manipulating ia (i ke kime). Search ua lawe mai Via ka selector $ () kuleana pili i. No ka laʻana, $ ( 'div').

Nā Mahouka hiki ke hoʻolaha ke kaumaha ma muli ana i ke koho ana o hehee wale:

• walaʻauʻana;
• ma ka kaila;
• ka luna kiʻekiʻe;
• maʻiʻo;
• ma ke kulana;
• koho ana o ka palapala mahinaʻai;
• 'ē aʻe.

Key Mahouka

I ka 90% o ka hihia ia ka hoʻohana 'ana i kēia waihona ua hoʻohana' JQuery-selector no i ka papa kuhikuhiE hui. mau loa na mea a moakaka ia mau mea a pau o ia mau mea. E hoi kakou i kela mea keia mea o lakou.

• * - Nāna e koho i nā mea a pauʻaoʻao hehee wale, a me ke poo, kino, a pela aku;.
• P / div / sidebar / ... - Nāna e koho i nā kumu mua e pili ana i ka hoʻoholo ma mua Tag ( 'o ia hoʻi i ka p.div, sidebar, a pela aku ...);
• .myClass / p.myClass - Nāna e koho i nā kumu a me ka mea i hoakaka ia papa inoa;
• # MyID / pa # myID -. Nāna e koho i kekahi i kekahi ikamu a me ka haawi mai ai ID.

Eia he laʻana. E ka olelo aku mākou pono, e koho i nā kumu ma ka 'aoʻao par papa e komo aku ai me ka, e e like penei: (. Par) $. Inā e pono ai wale nō P oihana mua o keia ano, a laila, kākau: $ (p.par).

kaila Mahouka

Hiki nō ke hoʻohana i ka papa kuhikuhiE-selector JQuery, ina ua pono, e koho i ka'ikamu pili ana i kekahi papa ka ID a koho i nā kumu ma kaʻaoʻao. Eia naʻe, eia nā hihia i ka wa a ka'ikamu i ole papa paha ID. Ia mea no ia, a ma laila nō i huli ma ka kaila. Ka mea, ae oe, e hana i ke koho ma kekahi kaila o ka HTML-hehee wale, e like me href paha src. Kēia kaila Ua kākau i loko o ʻahā like brackets [].

Ke simplest laʻana: $ ([src]) - Nāna e koho i nā mea a pau kumu mua i i src kaila. He mea hiki ke mālama i ka hāpana ma ka hoike ole aku i kekahi kaila waiwai: $ ([src = 'http: // paena /' atikala / 132222 / waiwai ']).

Hiki nō ke hoʻohana i kekahi JQuery Mahouka ina e makemake e mālama i ke kahua o ka i waeia. No ka laʻana, $ (P [color = uliuli] [nui = 12]) - e wae ia mau kumu p, a i ka uliuli waihoʻoluʻu a me ka nui 12 wale.

Mahouka maʻiʻo

Ma ia hihia, ina e hiki ole koho i kumu mua me ka nānā 'ana ma kailaʻae a walaʻauʻana Mahouka, oe e hoʻohuli i ai i kā lākou maʻiʻo. I huina, he 4 selector o kēiaʻano.

• : Kekahi mau - E koho i hōkeo 'ikamu i loaʻa i ka hoakaka kikokikona;
• : Ua - e koho i nā kumu mua i pihaʻi me na oihana mua ano o ka laina;
• : Makua - e koho i nā kumu mua i pihaʻi me kekahi 'ē aʻe;
• : Empty - e koho i nā kumu mua i e ole no i kekahi'ē aʻe.

Eia he laʻana. E koho i nā kumu mua div, na ke kikokikona o ka Hello, e pono e kākau $ (div: kekahi mau ( 'Hello')).

Mahouka luna kiʻekiʻe

Aia o kekahi ala e koho i nā kumumea i loko o JQuery, oia - e like me kā lākou luna kiʻekiʻe (ia mea, o ka lākiō o kēlā me kēia 'ē aʻe ma luna o ka HTML-ʻaoʻao). A hailona no ia, no laila, ua haawi mau o ka loa kaulana, "keiki" a me ka "mamo".

Ma ka hihia mua i wae na kumu mua, i nā kauoha mamo (keiki) a me ka haawi mai hehee ai (kūpuna). No ka laʻana, e koho i nā kumu o ka papa ma ka malamalama papa a mea he keiki nav papa inoa, a laila, e pono e kākauʻana: $ (Ul # nav> li.light).

Ka lua o ka hihia - he oi mau. Aia hiki ke koho a me kaʻauhau'ēʻaʻe mamo o ka hehee ai. No ka laʻana, e koho i ka loulou i loko o ka papa nav i hoakaka ia: $ (Ul # nav he).

Pela, ma JQuery hehee hiki ke koho i ka likeʻoleʻaoʻao ma ka hoʻohana 'ana i mea kiko'î e like me ka papa, ID, kailaʻae, maʻiʻo a luna kiʻekiʻe o HTML-palapala oihana mua.