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CSS定位深入理解 完全掌握CSS定位 相對(duì)定位和絕對(duì)定位

2024-04-27 14:33:30
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CSS定位深入理解 完全掌握CSS定位 相對(duì)定位和絕對(duì)定位

其實(shí)前面的標(biāo)準(zhǔn)流和浮動(dòng)流都很理解,就是定位不太好理解,特別是相對(duì)定位和絕對(duì)定位,很多剛開(kāi)始學(xué)的同學(xué)不好區(qū)分。因此這里,小強(qiáng)老師和大家一起分享CSS定位的學(xué)習(xí)。通過(guò)我們前面的學(xué)習(xí),我們網(wǎng)頁(yè)布局方法:1.標(biāo)準(zhǔn)流(最穩(wěn)定)2.浮動(dòng)流(float其次)3.定位流(穩(wěn)定性最后)定位是完全脫離標(biāo)準(zhǔn)流的一種布局方式。其實(shí)前面的標(biāo)準(zhǔn)流和浮動(dòng)流都很理解,就是定位不太好理解,特別是相對(duì)定位和絕對(duì)定位,很多剛開(kāi)始學(xué)的同學(xué)不好區(qū)分。因此這里,小強(qiáng)老師和大家一起分享CSS定位的學(xué)習(xí)。我們知道,定位都是和方位名詞一起使用的,調(diào)整位置,大部分使用top,left,bottom,right配合使用的。首先我們看看定位的分類:

1.絕對(duì)定位absolute

position:absolute;絕對(duì)定位和相對(duì)定位用的相對(duì)來(lái)說(shuō),是比較多的地方。絕對(duì)定位到底有什么特點(diǎn),在這里小強(qiáng)老師,給大家總結(jié)一下。

1.如果定位沒(méi)有父盒子

那么這個(gè)盒子,加上絕對(duì)定位后,都是以瀏覽器的左上角為原點(diǎn),所有的移動(dòng),也是以該原點(diǎn)來(lái)移動(dòng)的。案例如圖:小強(qiáng)零零壹 http://www.xiaoqiang001.com預(yù)覽后小強(qiáng)零零壹 http://www.xiaoqiang001.com

2.如果有父盒子,但是父盒子,沒(méi)有定位,那么,結(jié)果不會(huì)變,這個(gè)盒子還是會(huì)以瀏覽器的左上角為原點(diǎn)。

小強(qiáng)零零壹 http://www.xiaoqiang001.com預(yù)覽后小強(qiáng)零零壹 http://www.xiaoqiang001.com

3.如果有父盒子,并且父盒子有定位,那么此時(shí),絕對(duì)定位會(huì)以父盒子的左上角為原點(diǎn),對(duì)齊。

如圖:小強(qiáng)零零壹 http://www.xiaoqiang001.com生成效果: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