{"id":4711,"date":"2015-03-16T01:13:45","date_gmt":"2015-03-15T17:13:45","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=4711"},"modified":"2017-04-16T16:48:11","modified_gmt":"2017-04-16T08:48:11","slug":"background-object-position-value-percent","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2015\/03\/background-object-position-value-percent\/","title":{"rendered":"CSS &lt;position&gt;\u503c\u7b80\u4ecb\u7406\u89e3background\u767e\u5206\u6bd4\u5b9a\u4f4d"},"content":{"rendered":"<p>by <a href=\"http:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"http:\/\/www.zhangxinxu.com\/\">http:\/\/www.zhangxinxu.com<\/a><br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"http:\/\/www.zhangxinxu.com\/wordpress\/?p=4711\">http:\/\/www.zhangxinxu.com\/wordpress\/?p=4711<\/a><\/p>\n<p><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/position_value\" target=\"_blank\">MDN\u4e0a<\/a>\u5bf9<code>&lt;position&gt;<\/code>\u503c\u89e3\u91ca\u662f\uff1a\u4e00\u79cdCSS\u6570\u636e\u7c7b\u578b\uff0c2D\u5750\u6807\u7a7a\u95f4\uff0c\u7528\u6765\u8bbe\u7f6e\u76f8\u5bf9\u76d2\u5b50\u7684\u5750\u6807\u3002<\/p>\n<p>\u6211\u4eec\u7ecf\u5e38\u4f7f\u7528\u7684<code>background-position<\/code>\u7684\u503c\u5c31\u662f<code>&lt;position&gt;<\/code>\u503c\uff0c\u6700\u8fd1\u521a\u4ecb\u7ecd\u7684<code>object-position<\/code>\u7684\u503c\u4e5f\u662f<code>&lt;position&gt;<\/code>\u503c\u3002<\/p>\n<p><code>&lt;position&gt;<\/code>\u503c\u652f\u63011~4\u4e2a\u503c\uff0c\u53ef\u4ee5\u662f\u5177\u4f53\u6570\u503c\uff0c\u4e5f\u53ef\u4ee5\u662f\u767e\u5206\u6bd4\uff0c\u4e5f\u53ef\u4ee5\u662f<code>left<\/code>, <code>top<\/code>, <code>right<\/code>, <code>center<\/code>, <code>bottom<\/code>\u5173\u952e\u5b57\u3002\u53ef\u53c2\u8003\u4e0b\u56fe\u7ecf\u5178\u793a\u610f\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201503\/position_type.png\" width=\"815\" height=\"519\" alt=\"position\u7c7b\u578b\u56fe\u7247\u793a\u610f\" class=\"alignnone\" \/><\/p>\n<p>\u5982\u679c\u504f\u79fb\u6ca1\u6709\u76f8\u5e94\u7684\u5173\u952e\u5b57\uff0c\u5219\u4f1a\u88ab\u8ba4\u4e3a\u662f<code>center<\/code>, \u56e0\u6b64\uff0c<code>background-position:top center<\/code>\u53ef\u4ee5\u76f4\u63a5\u5199\u4f5c<code>background-position:top<\/code>\u3002<\/p>\n<p>\u5982\u679c\u540c\u65f6\u51fa\u73b03\u4e2a\u503c\u62164\u4e2a\u503c\uff0c\u5219\u8868\u793a\u53ef\u4ee5\u6307\u5b9a\u504f\u79fb\u7684\u76f8\u5bf9\u4f4d\u7f6e\uff0c\u8fd9\u662fCSS3\u65b0\u7279\u6027\uff0c\u73b0\u4ee3\u6d4f\u89c8\u5668\u4e0b\u624d\u652f\u6301\u3002\u5305\u62ec\uff1aChrome 25+, Firefox 13+, IE 9+, Opera 10.5+, Safari\/iOS 7+ . <\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>background-position: right 40px bottom 20px;<\/pre>\n<\/div>\n<p>\u6548\u679c\u5219\u662f\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201503\/2015-03-16_003327.png\" width=\"430\" height=\"306\" alt=\"IE9\u4e0bbackground-position 4\u503c\u6548\u679c\u622a\u56fe\" class=\"alignnone\" \/><\/p>\n<p>\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a class=\"a_link\" href=\"http:\/\/www.zhangxinxu.com\/study\/201503\/background-position-four-value.html\" target=\"_blank\">background-position 4\u503c\u6548\u679cDemo<\/a><\/p>\n<p>\u54c7\u54e6\uff0cIE9\u90fd\u652f\u6301\uff0c\u5e94\u8be5\u53ef\u4ee5\u6109\u5feb\u5730\u4f7f\u7528\u4e86\u5427\uff01\u62b1\u6b49\uff0c\u6211\u8981\u6cfc\u70b9\u51b7\u6c34\u3002\u8c8c\u4f3cAndroid\u7684\u652f\u6301\u6709\u4e9b\u7cdf\u7cd5\uff0c\u636e\u8bf4\uff1aAndroid 4.4\u624d\u652f\u6301\uff0cAndroid 4.0~4.2\u90fd\u4e0d\u652f\u6301\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u5728\u5b9e\u73b0\u6b64\u7c7b\u6548\u679c\u7684\u65f6\u5019\uff0c\u53ef\u80fd\u8fd8\u9700\u8981\u7559\u4e00\u624b\uff0c\u5982\u4e0b\uff0c\u4f7f\u7528<code>calc<\/code>\u8ba1\u7b97\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>background-position: calc(100% - 40px) calc(100% -20px);<\/pre>\n<\/div>\n<p>\u4f7f\u7528<code>calc<\/code>\u8ba1\u7b97\u603b\u4f53\u6765\u8bf4\u517c\u5bb9\u6027\u597d\u4e00\u70b9\uff0c\u4f46\u662f\uff0cIE9\u6d4f\u89c8\u5668\u4e0b\uff0c\u6839\u636ecaniuse\u7684\u8bf4\u6cd5\uff0c\u4f1a\u8ba9IE9\u6d4f\u89c8\u5668\u5954\u6e83\u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201503\/2015-03-16_003717.png\" width=\"453\" height=\"119\" alt=\"IE9 background-position calc\u5954\u6e83\" class=\"alignnone\" \/><\/p>\n<p>\u56e0\u6b64\uff0c\u5b9e\u9645\u4f7f\u7528\u8fd8\u9700\u8981\u6839\u636e\u573a\u666f\u5206\u522b\u6216hack\u5904\u7406\u3002<\/p>\n<p><strong>\u767e\u5206\u6bd4\u5355\u4f4d<\/strong><br \/>\n<code>background-position<\/code>\u4e2d\u7684\u767e\u5206\u6bd4\u5355\u4f4d\u662f\u4e2a\u5f88\u6709\u610f\u601d\u7684\u4e1c\u897f\u3002\u5176\u8868\u73b0\u4e0eCSS\u4e2d\u5176\u4ed6\u7684\u767e\u5206\u6bd4\u5355\u4f4d\u8868\u73b0\u90fd\u4e0d\u4e00\u6837\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u4e00\u4e2a\u56fe\u7247\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>img { position: absolute; left: 100%; }<\/pre>\n<\/div>\n<p>\u4e00\u5b9a\u662f\u5728\u7236\u5bb9\u5668\u5916\u90e8\u3002\u4f46\u662f\uff0c\u5728<code>&lt;position&gt;<\/code>\u503c\u4e2d\uff0c\u5374\u662f\u4e0d\u4e00\u6837\u7684\u8868\u73b0\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u4e0b\u8fd9\u4e2aiframe\u793a\u610f\uff1a<br \/>\n<iframe src=\"http:\/\/www.zhangxinxu.com\/study\/201503\/position-percent.html\" allowtransparency=\"true\" frameborder=\"0\" scrolling=\"yes\" width=\"100%\" style=\"height: 270px;\" allowfullscreen=\"true\"> <\/iframe><\/p>\n<p>\u5176\u4e2d\uff0c\u4e0a\u9762\u7684\u59b9\u5b50\u662f<code>background-position<\/code>\u767e\u5206\u6bd4\uff0c\u4e0b\u9762\u768450%\u900f\u660e\u7684\u59b9\u5b50\u662f<code>left<\/code>\u767e\u5206\u6bd4\uff0c\u53ef\u4ee5\u770b\u51fa\u4e24\u8005\u7684\u5b9a\u4f4d\u5dee\u5f02\u3002<\/p>\n<p>\u8fd9\u5c31\u662f\u4e3a\u4f55<code>background-position:100% 100%<\/code>\u662f\u5b9a\u4f4d\u5728\u5bb9\u5668\u53f3\u4e0b\u89d2\u7684\u539f\u56e0\u3002<\/p>\n<p>\u90a3<code>&lt;position&gt;<\/code>\u503c\u5bf9\u5e94\u7684\u5bb9\u5668\u5750\u6807\u4f4d\u7f6e\u8be5\u5982\u4f55\u8ba1\u7b97\u5462\uff1f<\/p>\n<p>\u5b9e\u9645\u4e0a\u662f\u6709\u4e00\u4e2a\u516c\u5f0f\u7684\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>positionX = (\u5bb9\u5668\u7684\u5bbd\u5ea6-\u56fe\u7247\u7684\u5bbd\u5ea6) * percentX;\npositionY = (\u5bb9\u5668\u7684\u9ad8\u5ea6-\u56fe\u7247\u7684\u9ad8\u5ea6) * percentY;<\/pre>\n<\/div>\n<p>\u56e0\u6b64\uff0c\u5f53<code>background-position:100% 100%<\/code>\u65f6\u5019\uff0c\u5b9e\u9645\u5b9a\u4f4d\u503c\u5c31\u662f\u5bb9\u5668\u5c3a\u5bf8\u548c\u56fe\u7247\u5c3a\u5bf8\u7684\u5dee\u5f02\uff0c\u4e8e\u662f\uff0c\u5c31\u6709\u4e86\u53f3\u4e0b\u89d2\u5b9a\u4f4d\u6548\u679c\u3002<\/p>\n<p>\u6709\u4e2a\u8fd9\u4e2a\u516c\u5f0f\uff0c\u6211\u4eec\u4e5f\u80fd\u7406\u89e3\u767e\u5206\u6bd4\u8d1f\u503c\u7684\u4e00\u4e9b\u8868\u73b0\u4e86\uff0c\u6bd4\u65b9\u8bf4\u4f60\u89c9\u5f97\u4e0b\u9762\u4e24\u884cCSS\u5bf9\u5e94\u56fe\u7247\u7684\u8868\u73b0\u662f\uff1f<\/p>\n<div class=\"zxx_code\">\n<pre>background-position: -50% -50%;\n\nobject-position: -50% -50%<\/pre>\n<\/div>\n<p>\u662f\u4e0d\u662f\u89c9\u5f97\u5e94\u8be5\u662f\u5b9a\u4f4d\u5728\u5bb9\u5668\u7684\u5de6\u4e0a\u89d2\uff0c\u540c\u65f6\u6709\u90e8\u5206\u56fe\u7247\u8d85\u51fa\u5bb9\u5668\u5de6\u4e0a\u89d2\u9690\u85cf\u4e0d\u53ef\u89c1\uff0c\u5c31\u7c7b\u4f3c\u4e0a\u9762\u8fd9\u4e2a\u622a\u56fe\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201503\/2015-03-16_003327.png\" width=\"430\" height=\"306\" alt=\"IE9\u4e0bbackground-position 4\u503c\u6548\u679c\u622a\u56fe\" class=\"alignnone\" \/><\/p>\n<p>\u4f46\u662f\uff0c\u5b9e\u9645\u4e0a\uff0c\u4e0d\u597d\u610f\u601d\uff0c\u53ef\u80fd\u662f\u4f1a\u4e0b\u9762\u8fd9\u79cd\u6548\u679c\uff08\u6b64\u622a\u56fe\u6765\u81ea<a class=\"a_link\" href=\"http:\/\/www.zhangxinxu.com\/study\/201503\/css3-object-position.html\" target=\"_blank\">\u8fd9\u91cc\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb<\/a>\uff09\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201503\/2015-03-16_010003.png\" width=\"317\" height=\"246\" alt=\"\u8d1f\u503c\u767e\u5206\u6bd4\u5b9a\u4f4d\" class=\"alignnone\" \/><\/p>\n<p>\u63a5\u8fd1\u4e8e\u4e0b\u9762CSS\u7684\u6548\u679c\uff1a<\/p>\n<div class=\"zxx_code\">\n<pre>background-position: 40px 10px;<\/pre>\n<\/div>\n<p>\u6df1\u53d7\u4f20\u7edf\u767e\u5206\u6bd4\u5b9a\u4f4d\u8ff7\u60d1\u7684\u6211\u4eec\u53ef\u80fd\u4e00\u65f6\u95f4\u4f1a\u60f3\u4e0d\u901a\uff0c\u660e\u660e\u662f\u4e2a\u8d1f\u503c\u767e\u5206\u6bd4\u5b9a\u4f4d\uff0c\u600e\u4e48\u4f1a\u662f\u4e00\u4e2a\u6b63\u503c\u6548\u679c\u5462\uff1f\u8fd9\u4e0d\u79d1\u5b66\u554a\uff01<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201503\/bukexue.png\" width=\"194\" height=\"210\" alt=\"\u8fd9\u4e0d\u79d1\u5b66\u554a\" class=\"alignnone\" \/><\/p>\n<p>\u4f46\u662f\uff0c\u6211\u4eec\u5957\u7528<code>&lt;position&gt;<\/code>\u767e\u5206\u6bd4\u503c\u8ba1\u7b97\u516c\u5f0f\uff0c\u5c31\u8c41\u7136\u5f00\u6717\u4e86\uff01<\/p>\n<p>\u56e0\u4e3a\u56fe\u7247\u7684\u5c3a\u5bf8\u5927\u4e8e\u5bb9\u5668\u5c3a\u5bf8\uff0c\u6240\u4ee5\uff1a<\/p>\n<ul>\n<li>(\u5bb9\u5668\u7684\u5bbd\u5ea6-\u56fe\u7247\u7684\u5bbd\u5ea6) * -50% \u7684\u7ed3\u679c\u662f\u4e2a<strong>\u6b63\u503c<\/strong>\uff1b<\/li>\n<li>(\u5bb9\u5668\u7684\u9ad8\u5ea6-\u56fe\u7247\u7684\u9ad8\u5ea6) * -50% \u7684\u7ed3\u679c\u4e5f\u662f\u4e2a<strong>\u6b63\u503c<\/strong>;<\/li>\n<\/ul>\n<p>\u6240\u4ee5\u2026\u2026 \u6069\uff01\u76f8\u4fe1\u5927\u5bb6\u90fd\u5e94\u8be5\u61c2\u4e86\uff01<\/p>\n<p>\u6df1\u66f4\u534a\u591c\uff0c\u884c\u4e3a\u4ed3\u4fc3\uff0c\u9519\u8bef\u5728\u6240\u96be\u514d\uff0c\u6b22\u8fce\u6307\u6b63\uff0c\u6b22\u8fce\u8865\u5145\uff0c\u611f\u8c22\u9605\u8bfb\uff01<\/p>\n<p>\u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\uff0c\u4f1a\u7ecf\u5e38\u66f4\u65b0\u77e5\u8bc6\u70b9\u4ee5\u53ca\u4fee\u6b63\u4e00\u4e9b\u9519\u8bef\uff0c\u56e0\u6b64\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u539f\u51fa\u5904\uff0c\u65b9\u4fbf\u6eaf\u6e90\uff0c\u907f\u514d\u9648\u65e7\u9519\u8bef\u77e5\u8bc6\u7684\u8bef\u5bfc\uff0c\u540c\u65f6\u6709\u66f4\u597d\u7684\u9605\u8bfb\u4f53\u9a8c\u3002<br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"http:\/\/www.zhangxinxu.com\/wordpress\/?p=4711\">http:\/\/www.zhangxinxu.com\/wordpress\/?p=4711<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/position_value\" target=\"_blank\">MDN\u4e0a<\/a>\u5bf9<code>&lt;position&gt;<\/code>\u503c\u89e3\u91ca\u662f\uff1a\u4e00\u79cdCSS\u6570\u636e\u7c7b\u578b\uff0c2D\u5750\u6807\u7a7a\u95f4\uff0c\u7528\u6765\u8bbe\u7f6e\u76f8\u5bf9\u76d2\u5b50\u7684\u5750\u6807\u3002<\/p>\n<p>\u6211\u4eec\u7ecf\u5e38\u4f7f\u7528\u7684<code>background-position<\/code>\u7684\u503c\u5c31\u662f<code>&lt;position&gt;<\/code>\u503c\uff0c\u6700\u8fd1\u521a\u4ecb\u7ecd\u7684<code>object-position<\/code>\u7684\u503c\u4e5f\u662f<code>&lt;position&gt;<\/code>\u503c\u3002<\/p>\n<p><code>&lt;position&gt;<\/code>\u503c\u652f\u63011~4\u4e2a\u503c\uff0c\u53ef\u4ee5\u662f\u5177\u4f53\u6570\u503c\uff0c\u4e5f\u53ef\u4ee5\u662f\u767e\u5206\u6bd4\uff0c\u4e5f\u53ef\u4ee5\u662f\u2026\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[163,971,984,274,234,166],"_links":{"self":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/4711"}],"collection":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/comments?post=4711"}],"version-history":[{"count":0,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/4711\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/media?parent=4711"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/categories?post=4711"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/tags?post=4711"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}