{"id":722,"date":"2017-03-05T14:20:09","date_gmt":"2017-03-05T06:20:09","guid":{"rendered":"http:\/\/www.qdabc.cn\/?p=722"},"modified":"2017-03-05T13:34:27","modified_gmt":"2017-03-05T05:34:27","slug":"javascript-%e5%9c%a8%e5%be%aa%e7%8e%af%e4%b8%ad%e5%88%9b%e5%bb%ba%e9%97%ad%e5%8c%85%ef%bc%9a%e4%b8%80%e4%b8%aa%e5%b8%b8%e8%a7%81%e9%94%99%e8%af%af","status":"publish","type":"post","link":"http:\/\/www.qdabc.cn\/?p=722","title":{"rendered":"JavaScript\u2014\u5728\u5faa\u73af\u4e2d\u521b\u5efa\u95ed\u5305\uff1a\u4e00\u4e2a\u5e38\u89c1\u9519\u8bef"},"content":{"rendered":"<p>\u5728 JavaScript 1.7 \u5f15\u5165\u00a0<code>let<\/code>\u00a0\u5173\u952e\u5b57\u00a0\u4e4b\u524d\uff0c\u95ed\u5305\u7684\u4e00\u4e2a\u5e38\u89c1\u7684\u95ee\u9898\u53d1\u751f\u4e8e\u5728\u5faa\u73af\u4e2d\u521b\u5efa\u95ed\u5305\u3002\u53c2\u8003\u4e0b\u9762\u7684\u793a\u4f8b\uff1a<\/p>\n<pre class=\"brush:js;toolbar:false\">&lt;p id=\"help\"&gt;Helpful notes will appear here&lt;\/p&gt;\r\n&lt;p&gt;E-mail: &lt;input type=\"text\" id=\"email\" name=\"email\"&gt;&lt;\/p&gt;\r\n&lt;p&gt;Name: &lt;input type=\"text\" id=\"name\" name=\"name\"&gt;&lt;\/p&gt;\r\n&lt;p&gt;Age: &lt;input type=\"text\" id=\"age\" name=\"age\"&gt;&lt;\/p&gt;\r\nfunction showHelp(help) {\r\n  document.getElementById('help').innerHTML = help;\r\n}\r\n\r\nfunction setupHelp() {\r\n  var helpText = [\r\n      {'id': 'email', 'help': 'Your e-mail address'},\r\n      {'id': 'name', 'help': 'Your full name'},\r\n      {'id': 'age', 'help': 'Your age (you must be over 16)'}\r\n    ];\r\n\r\n  for (var i = 0; i &lt; helpText.length; i++) {\r\n    var item = helpText[i];\r\n    document.getElementById(item.id).onfocus = function() {\r\n      showHelp(item.help);\r\n    }\r\n  }\r\n}\r\n\r\nsetupHelp();<\/pre>\n<p>\u6570\u7ec4\u00a0<code>helpText<\/code>\u00a0\u4e2d\u5b9a\u4e49\u4e86\u4e09\u4e2a\u6709\u7528\u7684\u63d0\u793a\u4fe1\u606f\uff0c\u6bcf\u4e00\u4e2a\u90fd\u5173\u8054\u4e8e\u5bf9\u5e94\u7684\u6587\u6863\u4e2d\u7684\u8f93\u5165\u57df\u7684 ID\u3002\u901a\u8fc7\u5faa\u73af\u8fd9\u4e09\u9879\u5b9a\u4e49\uff0c\u4f9d\u6b21\u4e3a\u6bcf\u4e00\u4e2a\u8f93\u5165\u57df\u6dfb\u52a0\u4e86\u4e00\u4e2a\u00a0<code>onfocus<\/code>\u00a0\u00a0\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\uff0c\u4ee5\u4fbf\u663e\u793a\u5e2e\u52a9\u4fe1\u606f\u3002<\/p>\n<p>\u8fd0\u884c\u8fd9\u6bb5\u4ee3\u7801\u540e\uff0c\u60a8\u4f1a\u53d1\u73b0\u5b83\u6ca1\u6709\u8fbe\u5230\u60f3\u8981\u7684\u6548\u679c\u3002\u65e0\u8bba\u7126\u70b9\u5728\u54ea\u4e2a\u8f93\u5165\u57df\u4e0a\uff0c\u663e\u793a\u7684\u90fd\u662f\u5173\u4e8e\u5e74\u9f84\u7684\u6d88\u606f\u3002<\/p>\n<p>\u8be5\u95ee\u9898\u7684\u539f\u56e0\u5728\u4e8e\u8d4b\u7ed9\u00a0<code>onfocus<\/code>\u662f\u95ed\u5305\uff08setupHelp\uff09\u4e2d\u7684\u533f\u540d\u51fd\u6570\u800c\u4e0d\u662f\u95ed\u5305\u5bf9\u8c61\uff1b\u5728\u95ed\u5305\uff08setupHelp\uff09\u4e2d\u4e00\u5171\u521b\u5efa\u4e86\u4e09\u4e2a\u533f\u540d\u51fd\u6570\uff0c\u4f46\u662f\u5b83\u4eec\u90fd\u5171\u4eab\u540c\u4e00\u4e2a\u73af\u5883\uff08item\uff09\u3002\u5728\u00a0<code>onfocus<\/code>\u00a0\u7684\u56de\u8c03\u88ab\u6267\u884c\u65f6\uff0c\u5faa\u73af\u65e9\u5df2\u7ecf\u5b8c\u6210\uff0c\u4e14\u6b64\u65f6\u00a0<code>item<\/code>\u00a0\u53d8\u91cf\uff08\u7531\u6240\u6709\u4e09\u4e2a\u95ed\u5305\u6240\u5171\u4eab\uff09\u5df2\u7ecf\u6307\u5411\u4e86\u00a0<code>helpText<\/code>\u00a0\u5217\u8868\u4e2d\u7684\u6700\u540e\u4e00\u9879\u3002<\/p>\n<p>\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u4e00\u79cd\u65b9\u6848\u662f\u4f7fonfocus\u6307\u5411\u4e00\u4e2a\u65b0\u7684\u95ed\u5305\u5bf9\u8c61\u3002<\/p>\n<pre class=\"brush:js;toolbar:false\">function showHelp(help) {\r\n  document.getElementById('help').innerHTML = help;\r\n}\r\n\r\nfunction makeHelpCallback(help) {\r\n  return function() {\r\n    showHelp(help);\r\n  };\r\n}\r\n\r\nfunction setupHelp() {\r\n  var helpText = [\r\n      {'id': 'email', 'help': 'Your e-mail address'},\r\n      {'id': 'name', 'help': 'Your full name'},\r\n      {'id': 'age', 'help': 'Your age (you must be over 16)'}\r\n    ];\r\n\r\n  for (var i = 0; i &lt; helpText.length; i++) {\r\n    var item = helpText[i];\r\n    document.getElementById(item.id).onfocus = makeHelpCallback(item.help);\r\n  }\r\n}\r\n\r\nsetupHelp();<\/pre>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u53ef\u4ee5\u5982\u6211\u4eec\u6240\u671f\u671b\u7684\u90a3\u6837\u5de5\u4f5c\u3002\u6240\u6709\u7684\u56de\u8c03\u4e0d\u518d\u5171\u4eab\u540c\u4e00\u4e2a\u73af\u5883\uff0c\u00a0<code>makeHelpCallback<\/code>\u00a0\u51fd\u6570\u4e3a\u6bcf\u4e00\u4e2a\u56de\u8c03\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u73af\u5883\u3002\u5728\u8fd9\u4e9b\u73af\u5883\u4e2d\uff0c<code>help<\/code>\u00a0\u6307\u5411\u00a0<code>helpText<\/code>\u00a0\u6570\u7ec4\u4e2d\u5bf9\u5e94\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<p class=\"post-copyright\">\u6b22\u8fce\u5206\u4eab\u672c\u6587\uff0c\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u51fa\u5904\uff1a<a href=\"http:\/\/www.qdabc.cn\">\u524d\u7aefABC<\/a> &raquo; <a href=\"http:\/\/www.qdabc.cn\/?p=722\">JavaScript\u2014\u5728\u5faa\u73af\u4e2d\u521b\u5efa\u95ed\u5305\uff1a\u4e00\u4e2a\u5e38\u89c1\u9519\u8bef<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>\u5728 JavaScript 1.7 \u5f15\u5165\u00a0let\u00a0\u5173\u952e\u5b57\u00a0\u4e4b\u524d\uff0c\u95ed\u5305\u7684\u4e00\u4e2a\u5e38\u89c1\u7684\u95ee\u9898\u53d1\u751f\u4e8e\u5728\u5faa\u73af\u4e2d\u521b\u5efa\u95ed\u5305\u3002\u53c2\u8003\u4e0b\u9762\u7684\u793a\u4f8b\uff1a &lt;p id=&#8221;help&#8221;&gt;Helpful notes will  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":109,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[9,19],"_links":{"self":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/722"}],"collection":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=722"}],"version-history":[{"count":1,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/722\/revisions"}],"predecessor-version":[{"id":723,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/722\/revisions\/723"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/media\/109"}],"wp:attachment":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=722"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=722"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=722"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}