{"id":2224,"date":"2017-04-28T17:50:03","date_gmt":"2017-04-28T09:50:03","guid":{"rendered":"http:\/\/www.daliane.com\/?p=2224"},"modified":"2017-04-28T17:50:23","modified_gmt":"2017-04-28T09:50:23","slug":"jquery_dai_ma_you_hua_yao_ling","status":"publish","type":"post","link":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/jquery_dai_ma_you_hua_yao_ling\/","title":{"rendered":"jquery\u4ee3\u7801\u4f18\u5316\u8981\u9886"},"content":{"rendered":"

\n\t\u4e00\u3001\u6ce8\u610f\u5b9a\u4e49jQuery\u53d8\u91cf\u7684\u65f6\u5019\u6dfb\u52a0var\u5173\u952e\u5b57\n<\/p>\n

\n\t\u8fd9\u4e2a\u4e0d\u4ec5\u4ec5\u662fJQ\uff0c\u5728JS\u4e2d\u90fd\u662f\u5fc5\u987b\u7684\n<\/p>\n

\n\t\u4e8c\u3001\u5982\u679c\u6709\u591a\u4e2a\u53d8\u91cf\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e2avar\n<\/p>\n

\n\teg:var index=0,$main=$(“.main”);\n<\/p>\n

\n\t\u4e09\u3001\u5b9a\u4e49jQuery\u53d8\u91cf\u662f\u6dfb\u52a0$\u7b26\u53f7\n<\/p>\n

\n\teg:var $main=$(“.main”);\u5229\u4e8e\u4ee3\u7801\u7684\u9605\u8bfb\u6027\n<\/p>\n

\n\t\u56db\u3001DOM\u64cd\u4f5c\u8bf7\u52a1\u5fc5\u8bb0\u4f4f\u7f13\u5b58\uff08cache\uff09\n<\/p>\n

\n\tDOM\u64cd\u4f5c\u662f\u975e\u5e38\u8017\u8d39\u8d44\u6e90\u548c\u6027\u80fd\u7684\uff0c\u4e00\u822c\u5927\u90e8\u5206\u4eba\u559c\u6b22\u76f4\u63a5\u8fd9\u6837\uff1a\n<\/p>\n

\n\t$(“.main”).html(“\u7ed3\u675f”);\n<\/p>\n

\n\t$(“.main”).show();\n<\/p>\n

\n\t\u66f4\u597d\u7684\u662f\uff1a\n<\/p>\n

\n\tvar $main=$(“.main”)\uff1b\n<\/p>\n

\n\t\u518d\u53bb\u64cd\u4f5c\n<\/p>\n

\n\t\n<\/p>\n

\n\t\u4e94\u3001\u4f7f\u7528\u94fe\u5f0f\u64cd\u4f5c\n<\/p>\n

\n\t\u4e0a\u9762\u7684\u53ef\u4ee5\u66f4\u7b80\u5316\uff1a\n<\/p>\n

\n\tvar $main=$(“.main”)\uff1b\n<\/p>\n

\n\t$main.html(“\u7ed3\u675f”).show();\n<\/p>\n

\n\t\u516d\u3001\u7cbe\u7b80jQuery\u4ee3\u7801\n<\/p>\n

\n\t\u5c3d\u91cf\u628a\u4e00\u4e9b\u4ee3\u7801\u6574\u5408\u5230\u4e00\u8d77\uff0c\u5982\u4e0b\u9762\n<\/p>\n

\n\t$btn.click(function(){\n<\/p>\n

\n\t$main.css(‘width’,’80%’);\n<\/p>\n

\n\t$main.css(‘display’,’block’);\n<\/p>\n

\n\t});\n<\/p>\n

\n\t\u5e94\u8be5\u8fd9\u6837\uff1a\n<\/p>\n

\n\t\n<\/p>\n

\n\t$btn.click(function(){\n<\/p>\n

\n\t$main.css({\n<\/p>\n

\n\t“width”:”80%”,\n<\/p>\n

\n\t“display”:”block”\n<\/p>\n

\n\t})\n<\/p>\n

\n\t});\n<\/p>\n

\n\t \n<\/p>\n

\n\t\u4e03\u3001\u907f\u514d\u4f7f\u7528\u5168\u5c40\u7c7b\u578b\u7684\u9009\u62e9\u5668\n<\/p>\n

\n\t\u8bf7\u52ff\u5982\u4e0b\u65b9\u5f0f\u4e66\u5199\uff1a$(‘.something> *’);
\n\u8fd9\u6837\u4e66\u5199\u66f4\u597d\uff1a$(‘.something’).children();\n<\/p>\n

\n\t \n<\/p>\n

\n\t\u516b\u3001\u4e0d\u8981\u53e0\u52a0\u591a\u4e2aID\n<\/p>\n

\n\t\u8bf7\u52ff\u5982\u4e0b\u4e66\u5199\uff1a$(‘#something#children’);
\n\u8fd9\u6837\u5c31\u591f\u4e86\uff1a$(‘#children’);\n<\/p>\n

\n\t \n<\/p>\n

\n\t\u4e5d\u3001\u591a\u7528\u903b\u8f91\u5224\u65ad||\u6216\u8005&&\u6765\u63d0\u901f\n<\/p>\n

\n\t\u8bf7\u52ff\u5982\u4e0b\u4e66\u5199\uff1a\n<\/p>\n

\n\tif(!$something) {
\n    \u3000\u3000$something = $(‘#something ‘);
\n}\n<\/p>\n

\n\t\u8fd9\u6837\u4e66\u5199\u6027\u80fd\u66f4\u597d\uff1a\n<\/p>\n

\n\t$something=$something|| $(‘#something’);\n<\/p>\n

\n\t\u5341\u3001\u5c3d\u91cf\u4f7f\u7528\u66f4\u5c11\u7684\u4ee3\u7801\n<\/p>\n

\n\t\u4e0e\u5176\u8fd9\u6837\u4e66\u5199\uff1aif(string.length> 0){..}
\n\u4e0d\u5982\u8fd9\u6837\u4e66\u5199\uff1aif(string.length){..}\n<\/p>\n

\n\t \n<\/p>\n

\n\t\u5341\u4e00\u3001\u5c3d\u91cf\u4f7f\u7528.on\u65b9\u6cd5\n<\/p>\n

\n\t\u5982\u679c\u4f60\u4f7f\u7528\u6bd4\u8f83\u65b0\u7248\u672c\u7684jQuery\u7c7b\u5e93\u7684\u8bdd\uff0c\u8bf7\u4f7f\u7528.on\uff0c\u5176\u5b83\u4efb\u4f55\u65b9\u6cd5\u90fd\u662f\u6700\u7ec8\u4f7f\u7528.on\u6765\u5b9e\u73b0\u7684\u3002\n<\/p>\n

\n\t\u5341\u4e8c\u3001\u5c3d\u91cf\u4f7f\u7528\u6700\u65b0\u7248\u672c\u7684jQuery\n<\/p>\n

\n\t\u6700\u65b0\u7248\u672c\u7684jQuery\u62e5\u6709\u66f4\u597d\u7684\u6027\u80fd\uff0c\u4f46\u662f\u6700\u65b0\u7684\u7248\u672c\u53ef\u80fd\u4e0d\u652f\u6301ie6\/7\/8\uff0c\u6240\u4ee5\u5927\u5bb6\u9700\u8981\u81ea\u5df1\u9488\u5bf9\u5b9e\u9645\u60c5\u51b5\u9009\u62e9\u3002\n<\/p>\n

\n\t\u5341\u4e09\u3001\u5c3d\u91cf\u4f7f\u7528\u539f\u751f\u7684Javascript\n<\/p>\n

\n\t\u5982\u679c\u4f7f\u7528\u539f\u751f\u7684Javascript\u4e5f\u53ef\u4ee5\u5b9e\u73b0jQuery\u63d0\u4f9b\u7684\u529f\u80fd\u7684\u8bdd\uff0c\u63a8\u8350\u4f7f\u7528\u539f\u751f\u7684javascript\u6765\u5b9e\u73b0\u3002\n<\/p>\n

\n\teg:for in\n<\/p>\n

\n\t\u5341\u56db\u3001\u603b\u662f\u4ece#id\u9009\u62e9\u5668\u6765\u7ee7\u627f\n<\/p>\n

\n\t\u8fd9\u662fjQuery\u9009\u62e9\u5668\u7684\u4e00\u6761\u9ec4\u91d1\u6cd5\u5219\u3002jQuery\u9009\u62e9\u4e00\u4e2a\u5143\u7d20\u6700\u5feb\u7684\u65b9\u6cd5\u5c31\u662f\u7528ID\u6765\u9009\u62e9\u4e86\u3002\n<\/p>\n

\n\t\u6216\u8005\u4eceID\u9009\u62e9\u5668\u7ee7\u627f\u6765\u9009\u62e9\u591a\u4e2a\u5143\u7d20:\n<\/p>\n

\n\teg:$(‘#main p’).hide();\n<\/p>\n

\n\t\u5341\u4e94\u3001\u5728class\u524d\u9762\u4f7f\u7528tag\n<\/p>\n

\n\tjQuery\u4e2d\u7b2c\u4e8c\u5feb\u7684\u9009\u62e9\u5668\u5c31\u662ftag\u9009\u62e9\u5668\uff08\u5982$(\u2018head’)\uff09\uff0c\u56e0\u4e3a\u5b83\u548c\u76f4\u63a5\u6765\u81ea\u4e8e\u539f\u751f\u7684Javascript\u65b9\u6cd5\n<\/p>\n

\n\tgetElementByTagName()\u3002\u6240\u4ee5\u6700\u597d\u603b\u662f\u7528tag\u6765\u4fee\u9970class(\u5e76\u4e14\u4e0d\u8981\u5fd8\u4e86\u5c31\u8fd1\u7684ID)\n<\/p>\n

\n\t \n<\/p>\n

\n\tjQuery\u4e2dclass\u9009\u62e9\u5668\u662f\u6700\u6162\u7684\uff0c\u56e0\u4e3a\u5728IE\u6d4f\u89c8\u5668\u4e0b\u5b83\u4f1a\u904d\u5386\u6240\u6709\u7684DOM\u8282\u70b9\u3002\u5c3d\u91cf\u907f\u514d\u4f7f\u7528class\u9009\u62e9\u5668\u3002\u4e5f\u4e0d\u8981\u7528tag\u6765\u4fee\u9970ID\u3002\u4e0b\u9762\u7684\u4f8b\u5b50\u4f1a\u904d\u5386\u6240\u6709\u7684div\u5143\u7d20\u6765\u67e5\u627eid\u4e3a’content’\u7684\u90a3\u4e2a\u8282\u70b9\n<\/p>\n

\n\t\u5341\u516d\u3001\u4f7f\u7528\u5b50\u67e5\u8be2\n<\/p>\n

\n\t\u5c06\u7236\u5bf9\u8c61\u7f13\u5b58\u8d77\u6765\u4ee5\u5907\u5c06\u6765\u7684\u4f7f\u7528\n<\/p>\n

\n\t\u5341\u4e03\u3001 \u4f18\u5316\u9009\u62e9\u5668\u4ee5\u9002\u7528Sizzle\u7684\u201c\u4ece\u53f3\u81f3\u5de6\u201d\u6a21\u578b\n<\/p>\n

\n\t\u81ea\u7248\u672c1.3\u4e4b\u540e\uff0cjQuery\u91c7\u7528\u4e86Sizzle\u5e93\uff0c\u4e0e\u4e4b\u524d\u7684\u7248\u672c\u5728\u9009\u62e9\u5668\u5f15\u64ce\u4e0a\u7684\u8868\u73b0\u5f62\u5f0f\u6709\u5f88\u5927\u7684\u4e0d\u540c\u3002\u5b83\u7528\u201c\u4ece\u5de6\u81f3\u53f3\u201d\u7684\u6a21\u578b\u4ee3\u66ff\u4e86\u201c\u4ece\u53f3\u81f3\u5de6\u201d\u7684\u6a21\u578b\u3002\u786e\u4fdd\u6700\u53f3\u7684\u9009\u62e9\u5668\u5177\u4f53\u4e9b\uff0c\u800c\u5de6\u8fb9\u7684\u9009\u62e9\u5668\u9009\u62e9\u8303\u56f4\u8f83\u5bbd\u6cdb\u4e9b\uff1a\n<\/p>\n

\n\tvar $linkContacts = $(‘.contact-links div.side-wrapper’);\n<\/p>\n

\n\t\u5341\u516b\u3001 \u91c7\u7528find()\uff0c\u800c\u4e0d\u4f7f\u7528\u4e0a\u4e0b\u6587\u67e5\u627e\n<\/p>\n

\n\t.find()\u51fd\u6570\u7684\u786e\u5feb\u4e9b\u3002\u4f46\u662f\u5982\u679c\u4e00\u4e2a\u9875\u9762\u6709\u8bb8\u591aDOM\u8282\u70b9\u65f6\uff0c\u9700\u8981\u6765\u56de\u67e5\u627e\u65f6\uff0c\u53ef\u80fd\u9700\u8981\u66f4\u591a\u65f6\u95f4:\n<\/p>\n

\n\tvar $divs = $(‘#pageBody’).find(‘.testdiv’); \n<\/p>\n

\n\t\n<\/p>\n

\n\t\u4e8c\u5341\u3001 \u7f13\u5b58jQuery\u5bf9\u8c61\n<\/p>\n

\n\t\u5c06\u4f60\u7ecf\u5e38\u7528\u7684\u5143\u7d20\u7f13\u5b58\u8d77\u6765\uff1a\n<\/p>\n

\n\teg:\n<\/p>\n

\n\tvar $header = $(‘#header’);
\nvar $divs = header.find(‘div’);
\nvar $forms = header.find(‘form’);\n<\/p>\n

\n\t\u5f53\u8981\u8fdb\u884cDOM\u63d2\u5165\u65f6\uff0c\u5c06\u6240\u6709\u5143\u7d20\u5c01\u88c5\u6210\u4e00\u4e2a\u5143\u7d20\n<\/p>\n

\n\t\u4e8c\u5341\u4e00\u3001\u76f4\u63a5\u7684DOM\u64cd\u4f5c\u5f88\u6162\u3002\u5c3d\u53ef\u80fd\u5c11\u7684\u53bb\u66f4\u6539HTML\u7ed3\u6784\u3002\n<\/p>\n

\n\t\n<\/p>\n

\n
\n\t\t\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span>\n\t<\/div>\n
var<\/span> menu = '<ul id=\"menu\">'; <\/span>for<\/span> (var<\/span> i = 1; i < 100; i++) {\r\n    menu <\/span>+= '<li>' + i + '<\/li>';\r\n}\r\nmenu <\/span>+= '<\/ul>';\r\n$(<\/span>'#header').prepend(menu); <\/span>\/\/<\/span> \u5343\u4e07\u4e0d\u8981\u8fd9\u6837\u505a\uff1a<\/span> $('#header').prepend('<ul id=\"menu\"><\/ul>'); <\/span>for<\/span> (var<\/span> i = 1; i < 100; i++) {\r\n    $(<\/span>'#menu').append('<li>' + i + '<\/li>');\r\n}<\/span><\/pre>\n
\n\t\t\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span>\n\t<\/div>\n<\/div>\n
\n\t\u4e8c\u5341\u4e8c\u3001 \u5c3d\u7ba1jQuery\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u4f46\u5f00\u53d1\u8005\u4e5f\u5e94\u8be5\u68c0\u67e5\u5bf9\u8c61\n<\/p>\n
\n\t\u5c3d\u7ba1jQuery\u4e0d\u4f1a\u629b\u51fa\u5927\u91cf\u7684\u5f02\u5e38\u7ed9\u7528\u6237\uff0c\u4f46\u662f\u5f00\u53d1\u8005\u4e5f\u4e0d\u8981\u4f9d\u8d56\u4e8e\u6b64\u3002jQuery\u901a\u5e38\u4f1a\u6267\u884c\u4e86\u4e00\u5927\u5806\u6ca1\u7528\u7684\u51fd\u6570\u4e4b\u540e\u624d\u786e\u5b9a\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u5b58\u5728\u3002\u6240\u4ee5\u5728\u5bf9\u4e00\u4e2a\u4f5c\u4e00\u7cfb\u5217\u5f15\u7528\u4e4b\u524d\uff0c\u5e94\u5148\u68c0\u67e5\u4e00\u4e0b\u8fd9\u4e2a\u5bf9\u8c61\u5b58\u4e0d\u5b58\u5728\u3002\n<\/p>\n
\n\t\u4e8c\u5341\u4e09. \u4f7f\u7528\u76f4\u63a5\u51fd\u6570\uff0c\u800c\u4e0d\u8981\u4f7f\u7528\u4e0e\u4e0e\u4e4b\u7b49\u540c\u7684\u51fd\u6570\n<\/p>\n
\n\t\u4e3a\u4e86\u83b7\u5f97\u66f4\u597d\u7684\u6027\u80fd\uff0c\u4f60\u5e94\u8be5\u4f7f\u7528\u76f4\u63a5\u51fd\u6570\u5982$.ajax()\uff0c\u800c\u4e0d\u8981\u4f7f\u7528$.get(),$.getJSON(),$.post()\uff0c\u56e0\u4e3a\u540e\u9762\u7684\u51e0\u4e2a\u5c06\u4f1a\u8c03\u7528$.ajax()\u3002\n<\/p>\n
\n\t\u4e8c\u5341\u56db\u3001 \u4f7f\u7528jQuery utility\u51fd\u6570\n<\/p>\n
\n\t\u4e0d\u8981\u5fd8\u4e86\u7b80\u5355\u5b9e\u7528\u7684jQuery\u7684utility\u51fd\u6570\u3002\u6211\u6700\u559c\u6b22\u7684\u662f$.isFunction(), $isArray()\u548c$.each()\u3002\n<\/p>\n
\n\t\u4e8c\u5341\u4e94\u3001\u63a8\u8fdf\u5230$(window).load\n<\/p>\n
\n\t\u6709\u65f6\u5019\u91c7\u7528$(window).load()\u6bd4$(document).ready()\u66f4\u5feb\uff0c\u56e0\u4e3a\u540e\u8005\u4e0d\u7b49\u6240\u6709\u7684DOM\u5143\u7d20\u90fd\u4e0b\u8f7d\u5b8c\u4e4b\u524d\u6267\u884c\u3002\u4f60\u5e94\u8be5\u5728\u4f7f\u7528\u5b83\u4e4b\u524d\u6d4b\u8bd5\u5b83\u3002\n<\/p>\n
\n\t\u4e8c\u5341\u516d\u3001\u5982\u679c\u7ed915\u4e2a\u4ee5\u4e0a\u7684\u5143\u7d20\u52a0\u6837\u5f0f\u65f6\uff0c\u76f4\u63a5\u7ed9DOM\u5143\u7d20\u6dfb\u52a0style\u6807\u7b7e\n<\/p>\n
\n\t$(‘<style type=”text\/css”> div.class { color: red; }<\/style>’)
\n.appendTo(‘head’);\n<\/p>\n
\n\t\u4e8c\u5341\u4e03\u3001\u538b\u7f29\u6210\u4e00\u4e2a\u4e3bJS\u6587\u4ef6\uff0c\u5c06\u4e0b\u8f7d\u6b21\u6570\u4fdd\u6301\u5230\u6700\u5c11\n<\/p>\n
\"2017-04-28_174928\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u3001\u6ce8\u610f\u5b9a\u4e49jQuery\u53d8\u91cf\u7684\u65f6\u5019\u6dfb\u52a0var\u5173\u952e\u5b57 \u8fd9\u4e2a\u4e0d\u4ec5\u4ec5\u662fJQ\uff0c\u5728JS\u4e2d\u90fd\u662f\u5fc5\u987b\u7684 \u4e8c\u3001\u5982\u679c\u6709\u591a\u4e2a\u53d8\u91cf\u53ef…<\/p>\n","protected":false},"author":2,"featured_media":2225,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[38],"tags":[233,22],"_links":{"self":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/2224"}],"collection":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/comments?post=2224"}],"version-history":[{"count":2,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/2224\/revisions"}],"predecessor-version":[{"id":2228,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/2224\/revisions\/2228"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/media\/2225"}],"wp:attachment":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/media?parent=2224"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/categories?post=2224"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/tags?post=2224"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}