{"id":435,"date":"2021-05-28T11:16:21","date_gmt":"2021-05-28T03:16:21","guid":{"rendered":"https:\/\/sanlangcode.com\/?p=435"},"modified":"2021-05-28T11:16:21","modified_gmt":"2021-05-28T03:16:21","slug":"%e3%80%90%e6%b5%8b%e8%af%95%e3%80%91web%e8%87%aa%e5%8a%a8%e5%8c%96%e6%b5%8b%e8%af%95xpath","status":"publish","type":"post","link":"https:\/\/sanlangcode.com\/index.php\/2021\/05\/28\/%e3%80%90%e6%b5%8b%e8%af%95%e3%80%91web%e8%87%aa%e5%8a%a8%e5%8c%96%e6%b5%8b%e8%af%95xpath\/","title":{"rendered":"\u3010\u6d4b\u8bd5\u3011web\u81ea\u52a8\u5316\u6d4b\u8bd5(xpath)"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">\u4ec0\u4e48\u662fxpath\uff1f<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>XPath\u5373\u4e3aXML\u8def\u5f84\u8bed\u8a00\uff0c\u5b83\u662f\u4e00\u79cd\u7528\u6765\u786e\u5b9aXML\uff08\u6807\u51c6\u901a\u7528\u6807\u8bb0\u8bed\u8a00\u7684\u5b50\u96c6\uff09\u6587\u6863\u4e2d\u67d0\u90e8\u5206\u4f4d\u7f6e\u7684\u8bed\u8a00\u3002XPath\u57fa\u4e8eXML\u7684\u6811\u72b6\u7ed3\u6784\uff0c\u6709\u4e0d\u540c\u7c7b\u578b\u7684\u8282\u70b9\uff0c\u5305\u62ec\u5143\u7d20\u8282\u70b9\uff0c\u5c5e\u6027\u8282\u70b9\u548c\u6587\u672c\u8282\u70b9\uff0c\u63d0\u4f9b\u5728\u6570\u636e\u7ed3\u6784\u6811\u4e2d\u627e\u5bfb\u8282\u70b9\u7684\u80fd\u529b\u3002[1] \u8d77\u521d XPath \u7684\u63d0\u51fa\u7684\u521d\u8877\u662f\u5c06\u5176\u4f5c\u4e3a\u4e00\u4e2a\u901a\u7528\u7684\u3001\u4ecb\u4e8eXPointer\u4e0eXSLT\u95f4\u7684\u8bed\u6cd5\u6a21\u578b\u3002\u4f46\u662f XPath \u5f88\u5feb\u7684\u88ab\u5f00\u53d1\u8005\u91c7\u7528\u6765\u5f53\u4f5c\u5c0f\u578b\u67e5\u8be2\u8bed\u8a00\u3002<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u4ec0\u4e48\u662fXML?<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>* XML \u6307\u53ef\u6269\u5c55\u6807\u8bb0\u8bed\u8a00\uff08EXtensible Markup Language\uff09<br>* XML \u662f\u4e00\u79cd\u6807\u8bb0\u8bed\u8a00\uff0c\u5f88\u7c7b\u4f3c HTML<br>* XML \u7684\u8bbe\u8ba1\u5b97\u65e8\u662f\u4f20\u8f93\u6570\u636e\uff0c\u800c\u975e\u663e\u793a\u6570\u636e<br>* XML \u7684\u6807\u7b7e\u9700\u8981\u6211\u4eec\u81ea\u884c\u5b9a\u4e49\u3002<br>* XML \u88ab\u8bbe\u8ba1\u4e3a\u5177\u6709\u81ea\u6211\u63cf\u8ff0\u6027\u3002<br>* XML \u662f W3C \u7684\u63a8\u8350\u6807\u51c6<\/code><\/pre>\n\n\n\n<p>W3School\u5b98\u65b9\u6587\u6863\uff1ahttp:\/\/www.w3school.com.cn\/xml\/index.asp<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">XML\u4e0eHTML\u7684\u533a\u522b<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">xpath\u8def\u5f84\u8bed\u53e5\u5728\u81ea\u52a8\u5316web\u6d4b\u8bd5\u4e2d\u7684\u4f5c\u7528<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5728\u6211\u4eec\u505a\u624b\u52a8\u6d4b\u8bd5\u7684\u624b\uff0c\u6211\u4eec\u53ef\u4ee5\u5f88\u8f7b\u6613\u7684\u627e\u5230\u6211\u4eec\u9700\u8981\u70b9\u51fb\u7684\u8f93\u5165\u6846\u3001\u6309\u94ae\u7b49\uff0c\u4f46\u662f\u8ba1\u7b97\u673a\u6ca1\u6709\u8fd9\u4e48\u667a\u80fd\uff0c\u4e8e\u662f\u6211\u4eec\u5c31\u7528\u5230\u4e86xpath\u8def\u5f84\u8868\u8fbe\u5f0f\u6765\u5728\u4e00\u4e2aweb\u9875\u9762\u4e2d\u5b9a\u4f4d\u5143\u7d20\uff0c\u5176\u8bed\u6cd5\u540ccss\u6709\u5f02\u66f2\u540c\u5de5\u4e4b\u5904\uff0c\u540c\u5b66\u4eec\u53ef\u4ee5\u5728\u4e24\u8005\u4e4b\u95f4\u9009\u62e9\u4e00\u4e2a\uff0c\u5f53\u7136\u6700\u597d\u90fd\u638c\u63e1<\/li><\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">\u8282\u70b9\u4e4b\u95f4\u7684\u5173\u7cfb<\/h1>\n\n\n\n<h4 class=\"wp-block-heading\">\u20031.\u7236(parent)<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">\u2003\u2003\u6bcf\u4e2a\u5143\u7d20\u4ee5\u53ca\u5c5e\u6027\u90fd\u6709\u4e00\u4e2a\u7236\u3002<\/h5>\n\n\n\n<h5 class=\"wp-block-heading\">\u2003\u2003\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684XML\u4f8b\u5b50\u4e2d\uff0cbook \u5143\u7d20\u662f title\u3001author\u3001year \u4ee5\u53ca price \u5143\u7d20\u7684\u7236\uff1a<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>    &lt;?xml version=\"1.0\" encoding=\"utf-8\"?&gt;<br>    &lt;book&gt;<br>      &lt;title&gt;Harry Potter&lt;\/title&gt;<br>      &lt;author&gt;J K. Rowling&lt;\/author&gt;<br>      &lt;year&gt;2005&lt;\/year&gt;<br>      &lt;price&gt;29.99&lt;\/price&gt;<br>    &lt;\/book&gt;<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u20032.\u5b50(Children)<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">\u2003\u2003\u5143\u7d20\u8282\u70b9\u53ef\u6709\u96f6\u4e2a\u3001\u4e00\u4e2a\u6216\u591a\u4e2a\u5b50\u3002<\/h5>\n\n\n\n<h5 class=\"wp-block-heading\">\u2003\u2003\u5728\u4e0b\u9762\u7684\u4f8b\u5b50\u4e2d\uff0ctitle\u3001author\u3001year \u4ee5\u53ca price \u5143\u7d20\u90fd\u662f book \u5143\u7d20\u7684\u5b50\uff1a<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>    &lt;?xml version=\"1.0\" encoding=\"utf-8\"?&gt;<br>    &lt;book&gt;<br>      &lt;title&gt;Harry Potter&lt;\/title&gt;<br>      &lt;author&gt;J K. Rowling&lt;\/author&gt;<br>      &lt;year&gt;2005&lt;\/year&gt;<br>      &lt;price&gt;29.99&lt;\/price&gt;<br>    &lt;\/book&gt;<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u20033.\u540c\u80de(Sibling)<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">\u2003\u2003\u62e5\u6709\u76f8\u540c\u7684\u7236\u7684\u8282\u70b9<\/h5>\n\n\n\n<h5 class=\"wp-block-heading\">\u2003\u2003\u5728\u4e0b\u9762\u7684\u4f8b\u5b50\u4e2d\uff0ctitle\u3001author\u3001year \u4ee5\u53ca price \u5143\u7d20\u90fd\u662f\u540c\u80de\uff1a<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>    &lt;?xml version=\"1.0\" encoding=\"utf-8\"?&gt;<br>    &lt;book&gt;<br>      &lt;title&gt;Harry Potter&lt;\/title&gt;<br>      &lt;author&gt;J K. Rowling&lt;\/author&gt;<br>      &lt;year&gt;2005&lt;\/year&gt;<br>      &lt;price&gt;29.99&lt;\/price&gt;<br>    &lt;\/book&gt;<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u20034.\u5148\u8f88(Ancestor)<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">\u2003\u2003\u67d0\u8282\u70b9\u7684\u7236\u3001\u7236\u7684\u7236\uff0c\u7b49\u7b49\u3002<\/h5>\n\n\n\n<h5 class=\"wp-block-heading\">\u2003\u2003\u5728\u4e0b\u9762\u7684\u4f8b\u5b50\u4e2d\uff0ctitle \u5143\u7d20\u7684\u5148\u8f88\u662f book \u5143\u7d20\u548c bookstore \u5143\u7d20\uff1a<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>    &lt;bookstore&gt;<br>    &lt;book&gt;<br>      &lt;title&gt;Harry Potter&lt;\/title&gt;<br>      &lt;author&gt;J K. Rowling&lt;\/author&gt;<br>      &lt;year&gt;2005&lt;\/year&gt;<br>      &lt;price&gt;29.99&lt;\/price&gt;<br>    &lt;\/book&gt;<br>    &lt;\/bookstore&gt;<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u20035.\u540e\u4ee3(Descendant)<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">\u2003\u2003\u67d0\u4e2a\u8282\u70b9\u7684\u5b50\uff0c\u5b50\u7684\u5b50\uff0c\u7b49\u7b49\u3002<\/h5>\n\n\n\n<h5 class=\"wp-block-heading\">\u2003\u2003\u5728\u4e0b\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cbookstore \u7684\u540e\u4ee3\u662f book\u3001title\u3001author\u3001year \u4ee5\u53ca price \u5143\u7d20\uff1a<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>    &lt;bookstore&gt;<br>    &lt;book&gt;<br>      &lt;title&gt;Harry Potter&lt;\/title&gt;<br>      &lt;author&gt;J K. Rowling&lt;\/author&gt;<br>      &lt;year&gt;2005&lt;\/year&gt;<br>      &lt;price&gt;29.99&lt;\/price&gt;<br>    &lt;\/book&gt;<br>    &lt;\/bookstore&gt;<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">xpath\u8def\u5f84\u8868\u8fbe\u5f0f<\/h1>\n\n\n\n<h4 class=\"wp-block-heading\">\u2003xpath\u8def\u5f84\u8868\u8fbe\u5f0f<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">\u2003XPath (XML Path Language) \u662f\u4e00\u95e8\u5728 XML \u6587\u6863\u4e2d\u67e5\u627e\u4fe1\u606f\u7684\u8bed\u8a00\uff0c\u53ef\u7528\u6765\u5728 XML \u6587\u6863\u4e2d\u5bf9\u5143\u7d20\u548c\u5c5e\u6027\u8fdb\u884c\u904d\u5386\u3002<\/h5>\n\n\n\n<h5 class=\"wp-block-heading\">\u2003W3School\u5b98\u65b9\u6587\u6863\uff1ahttp:\/\/www.w3school.com.cn\/xpath\/index.asp<\/h5>\n\n\n\n<h4 class=\"wp-block-heading\">\u9009\u53d6\u8282\u70b9<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">XPath \u4f7f\u7528\u8def\u5f84\u8868\u8fbe\u5f0f\u6765\u9009\u53d6 XML \u6587\u6863\u4e2d\u7684\u8282\u70b9\u6216\u8005\u8282\u70b9\u96c6\u3002\u8fd9\u4e9b\u8def\u5f84\u8868\u8fbe\u5f0f\u548c\u6211\u4eec\u5728\u5e38\u89c4\u7684\u7535\u8111\u6587\u4ef6\u7cfb\u7edf\u4e2d\u770b\u5230\u7684\u8868\u8fbe\u5f0f\u975e\u5e38\u76f8\u4f3c\u3002<\/h5>\n\n\n\n<h4 class=\"wp-block-heading\">\u4e0b\u9762\u5217\u51fa\u4e86\u6700\u5e38\u7528\u7684\u8def\u5f84\u8868\u8fbe\u5f0f\uff1a<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8868\u8fbe\u5f0f<\/th><th>\u63cf\u8ff0<\/th><\/tr><\/thead><tbody><tr><td>nodename<\/td><td>\u9009\u53d6\u6b64\u8282\u70b9\u7684\u6240\u6709\u5b50\u8282\u70b9\u3002<\/td><\/tr><tr><td>\/<\/td><td>\u4ece\u6839\u8282\u70b9\u9009\u53d6\u3002<\/td><\/tr><tr><td>\/\/<\/td><td>\u4ece\u5339\u914d\u9009\u62e9\u7684\u5f53\u524d\u8282\u70b9\u9009\u62e9\u6587\u6863\u4e2d\u7684\u8282\u70b9\uff0c\u800c\u4e0d\u8003\u8651\u5b83\u4eec\u7684\u4f4d\u7f6e\u3002<\/td><\/tr><tr><td>.<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u3002<\/td><\/tr><tr><td>..<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u7236\u8282\u70b9\u3002<\/td><\/tr><tr><td>@<\/td><td>\u9009\u53d6\u5c5e\u6027\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">\u5728\u4e0b\u9762\u7684\u8868\u683c\u4e2d\uff0c\u6211\u4eec\u5df2\u5217\u51fa\u4e86\u4e00\u4e9b\u8def\u5f84\u8868\u8fbe\u5f0f\u4ee5\u53ca\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\uff1a<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8def\u5f84\u8868\u8fbe\u5f0f<\/th><th>\u7ed3\u679c<\/th><\/tr><\/thead><tbody><tr><td>bookstore<\/td><td>\u9009\u53d6 bookstore \u5143\u7d20\u7684\u6240\u6709\u5b50\u8282\u70b9\u3002<\/td><\/tr><tr><td>\/bookstore<\/td><td>\u9009\u53d6\u6839\u5143\u7d20 bookstore\u3002\u6ce8\u91ca\uff1a\u5047\u5982\u8def\u5f84\u8d77\u59cb\u4e8e\u6b63\u659c\u6760( \/ )\uff0c\u5219\u6b64\u8def\u5f84\u59cb\u7ec8\u4ee3\u8868\u5230\u67d0\u5143\u7d20\u7684\u7edd\u5bf9\u8def\u5f84\uff01<\/td><\/tr><tr><td>bookstore\/book<\/td><td>\u9009\u53d6\u5c5e\u4e8e bookstore \u7684\u5b50\u5143\u7d20\u7684\u6240\u6709 book \u5143\u7d20\u3002<\/td><\/tr><tr><td>\/\/book<\/td><td>\u9009\u53d6\u6240\u6709 book \u5b50\u5143\u7d20\uff0c\u800c\u4e0d\u7ba1\u5b83\u4eec\u5728\u6587\u6863\u4e2d\u7684\u4f4d\u7f6e\u3002<\/td><\/tr><tr><td>bookstore\/\/book<\/td><td>\u9009\u62e9\u5c5e\u4e8e bookstore \u5143\u7d20\u7684\u540e\u4ee3\u7684\u6240\u6709 book \u5143\u7d20\uff0c\u800c\u4e0d\u7ba1\u5b83\u4eec\u4f4d\u4e8e bookstore \u4e4b\u4e0b\u7684\u4ec0\u4e48\u4f4d\u7f6e\u3002<\/td><\/tr><tr><td>\/\/@lang<\/td><td>\u9009\u53d6\u540d\u4e3a lang \u7684\u6240\u6709\u5c5e\u6027\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">\u8c13\u8bed\uff08Predicates\uff09<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">\u8c13\u8bed\u7528\u6765\u67e5\u627e\u67d0\u4e2a\u7279\u5b9a\u7684\u8282\u70b9\u6216\u8005\u5305\u542b\u67d0\u4e2a\u6307\u5b9a\u7684\u503c\u7684\u8282\u70b9\uff0c\u88ab\u5d4c\u5728\u65b9\u62ec\u53f7\u4e2d\u3002<\/h5>\n\n\n\n<h4 class=\"wp-block-heading\">\u5728\u4e0b\u9762\u7684\u8868\u683c\u4e2d\uff0c\u6211\u4eec\u5217\u51fa\u4e86\u5e26\u6709\u8c13\u8bed\u7684\u4e00\u4e9b\u8def\u5f84\u8868\u8fbe\u5f0f\uff0c\u4ee5\u53ca\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\uff1a<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8def\u5f84\u8868\u8fbe\u5f0f<\/th><th>\u7ed3\u679c<\/th><\/tr><\/thead><tbody><tr><td>\/bookstore\/book[1]<\/td><td>\u9009\u53d6\u5c5e\u4e8e bookstore \u5b50\u5143\u7d20\u7684\u7b2c\u4e00\u4e2a book \u5143\u7d20\u3002<\/td><\/tr><tr><td>\/bookstore\/book[last()]<\/td><td>\u9009\u53d6\u5c5e\u4e8e bookstore \u5b50\u5143\u7d20\u7684\u6700\u540e\u4e00\u4e2a book \u5143\u7d20\u3002<\/td><\/tr><tr><td>\/bookstore\/book[last()-1]<\/td><td>\u9009\u53d6\u5c5e\u4e8e bookstore \u5b50\u5143\u7d20\u7684\u5012\u6570\u7b2c\u4e8c\u4e2a book \u5143\u7d20\u3002<\/td><\/tr><tr><td>\/bookstore\/book[position()&lt;3]<\/td><td>\u9009\u53d6\u6700\u524d\u9762\u7684\u4e24\u4e2a\u5c5e\u4e8e bookstore \u5143\u7d20\u7684\u5b50\u5143\u7d20\u7684 book \u5143\u7d20\u3002<\/td><\/tr><tr><td>\/\/title[@lang]<\/td><td>\u9009\u53d6\u6240\u6709\u62e5\u6709\u540d\u4e3a lang \u7684\u5c5e\u6027\u7684 title \u5143\u7d20\u3002<\/td><\/tr><tr><td>\/\/title[@lang=\u2019eng\u2019]<\/td><td>\u9009\u53d6\u6240\u6709 title \u5143\u7d20\uff0c\u4e14\u8fd9\u4e9b\u5143\u7d20\u62e5\u6709\u503c\u4e3a eng \u7684 lang \u5c5e\u6027\u3002<\/td><\/tr><tr><td>\/bookstore\/book[price&gt;35.00]<\/td><td>\u9009\u53d6 bookstore \u5143\u7d20\u7684\u6240\u6709 book \u5143\u7d20\uff0c\u4e14\u5176\u4e2d\u7684 price \u5143\u7d20\u7684\u503c\u987b\u5927\u4e8e 35.00\u3002<\/td><\/tr><tr><td>\/bookstore\/book[price&gt;35.00]\/title<\/td><td>\u9009\u53d6 bookstore \u5143\u7d20\u4e2d\u7684 book \u5143\u7d20\u7684\u6240\u6709 title \u5143\u7d20\uff0c\u4e14\u5176\u4e2d\u7684 price \u5143\u7d20\u7684\u503c\u987b\u5927\u4e8e 35.00\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">\u9009\u53d6\u672a\u77e5\u8282\u70b9<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">XPath \u901a\u914d\u7b26\u53ef\u7528\u6765\u9009\u53d6\u672a\u77e5\u7684 XML \u5143\u7d20\u3002<\/h5>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u901a\u914d\u7b26<\/th><th>\u63cf\u8ff0<\/th><\/tr><\/thead><tbody><tr><td>*<\/td><td>\u5339\u914d\u4efb\u4f55\u5143\u7d20\u8282\u70b9\u3002<\/td><\/tr><tr><td>@*<\/td><td>\u5339\u914d\u4efb\u4f55\u5c5e\u6027\u8282\u70b9\u3002<\/td><\/tr><tr><td>node()<\/td><td>\u5339\u914d\u4efb\u4f55\u7c7b\u578b\u7684\u8282\u70b9\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">\u5728\u4e0b\u9762\u7684\u8868\u683c\u4e2d\uff0c\u6211\u4eec\u5217\u51fa\u4e86\u4e00\u4e9b\u8def\u5f84\u8868\u8fbe\u5f0f\uff0c\u4ee5\u53ca\u8fd9\u4e9b\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\uff1a<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8def\u5f84\u8868\u8fbe\u5f0f<\/th><th>\u7ed3\u679c<\/th><\/tr><\/thead><tbody><tr><td>\/bookstore\/*<\/td><td>\u9009\u53d6 bookstore \u5143\u7d20\u7684\u6240\u6709\u5b50\u5143\u7d20\u3002<\/td><\/tr><tr><td>\/\/*<\/td><td>\u9009\u53d6\u6587\u6863\u4e2d\u7684\u6240\u6709\u5143\u7d20\u3002<\/td><\/tr><tr><td>\/\/title[@*]<\/td><td>\u9009\u53d6\u6240\u6709\u5e26\u6709\u5c5e\u6027\u7684 title \u5143\u7d20\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u9009\u53d6\u82e5\u5e72\u8def\u5f84<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u901a\u8fc7\u5728\u8def\u5f84\u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528\u201c|\u201d\u8fd0\u7b97\u7b26\uff0c\u60a8\u53ef\u4ee5\u9009\u53d6\u82e5\u5e72\u4e2a\u8def\u5f84\u3002<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">\u5728\u4e0b\u9762\u7684\u8868\u683c\u4e2d\uff0c\u6211\u4eec\u5217\u51fa\u4e86\u4e00\u4e9b\u8def\u5f84\u8868\u8fbe\u5f0f\uff0c\u4ee5\u53ca\u8fd9\u4e9b\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\uff1a<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u8def\u5f84\u8868\u8fbe\u5f0f<\/td><td>\u7ed3\u679c<\/td><\/tr><tr><td>\/\/book\/title | \/\/book\/price<\/td><td>\u9009\u53d6 book \u5143\u7d20\u7684\u6240\u6709 title \u548c price \u5143\u7d20\u3002<\/td><\/tr><tr><td>\/\/title | \/\/price<\/td><td>\u9009\u53d6\u6587\u6863\u4e2d\u7684\u6240\u6709 title \u548c price \u5143\u7d20\u3002<\/td><\/tr><tr><td>\/bookstore\/book\/title | \/\/price<\/td><td>\u9009\u53d6\u5c5e\u4e8e bookstore \u5143\u7d20\u7684 book \u5143\u7d20\u7684\u6240\u6709 title \u5143\u7d20\uff0c\u4ee5\u53ca\u6587\u6863\u4e2d\u6240\u6709\u7684 price \u5143\u7d20\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">XPath\u7684\u8fd0\u7b97\u7b26(\u4e86\u89e3)<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u4e0b\u9762\u5217\u51fa\u4e86\u53ef\u7528\u5728 XPath \u8868\u8fbe\u5f0f\u4e2d\u7684\u8fd0\u7b97\u7b26\uff1a<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">\u8fd9\u4e9b\u5c31\u662fXPath\u7684\u8bed\u6cd5\u5185\u5bb9<\/h4>\n","protected":false},"excerpt":{"rendered":"<p>\u4ec0\u4e48\u662fxpath\uff1f 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