{"id":735,"date":"2022-01-07T20:34:37","date_gmt":"2022-01-07T12:34:37","guid":{"rendered":"http:\/\/www.henrycome.com\/wordpress\/?p=735"},"modified":"2022-01-15T16:40:21","modified_gmt":"2022-01-15T08:40:21","slug":"20220107203513","status":"publish","type":"post","link":"http:\/\/www.henrycome.com\/wordpress\/202201072034\/735","title":{"rendered":"\u3010JS\u57fa\u7840\u7b14\u8bb0\u3011-\u51fd\u6570\u3001\u4f5c\u7528\u57df\u3001\u4e8b\u4ef6\u3001\u4e25\u683c\u6a21\u5f0f"},"content":{"rendered":"\n<p>\u5f88\u4e45\u4e4b\u524d\u5de5\u4f5c\u9700\u8981\u5c31\u4f7f\u7528\u8fc7\u57fa\u7840\u7684JS\uff0c\u65ad\u65ad\u7eed\u7eed\u63a5\u89e6\uff0c\u4f46\u662f\u4e00\u76f4\u6ca1\u80fd\u7ee7\u7eed\u6df1\u5165\u3002\u9020\u6210\u7528\u5230\u7684\u65f6\u5019\u5b66\u4f1a\u4e00\u70b9\uff0c\u65f6\u95f4\u4e45\u4e00\u70b9\u5c31\u5fd8\u5b8c\u4e86\u3002\u4eca\u5929\u518d\u56de\u5934\u67e5\u6f0f\u8865\u7f3a\uff0c\u628a\u57fa\u7840\u77e5\u8bc6\u518d\u770b\u4e00\u4e0b\u3002<\/p>\n\n\n\n<p>\u5b66\u4e60\u5bf9\u8c61\uff1a\u975e\u5e38\u597d\u7684\u81ea\u5b66\u7f51\u7ad9\uff1a\u83dc\u9e1f\u6559\u7a0b\uff1a<a href=\"https:\/\/www.runoob.com\/js\/js-tutorial.html\">JavaScript \u6559\u7a0b | \u83dc\u9e1f\u6559\u7a0b<\/a><\/p>\n\n\n\n<p><br>\u4e0b\u9762\u6211\u5c31\u6311\u9009\u4e00\u4e9b\u4e0d\u719f\u6089\u7684\u5c0f\u8282\uff0c\u4e00\u8282\u4e00\u8282\u7684\u5199\u7b14\u8bb0\uff1a<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. JavaScript \u51fd\u6570  <\/h2>\n\n\n\n<p>JavaScript \u51fd\u6570 | \u83dc\u9e1f\u6559\u7a0b<br>https:\/\/www.runoob.com\/js\/js-functions.html<\/p>\n\n\n\n<p>\u5c0f\u77e5\u8bc6\u70b9\uff1a<\/p>\n\n\n\n<ul><li>\u51fd\u6570\u7684\u521b\u5efa\uff0c\u4f7f\u7528\u5173\u952e\u5b57function\u8981\u5c0f\u5199\uff0c\u56e0\u4e3ajs\u662f\u5927\u5c0f\u5199\u654f\u611f\u7684\uff08\u548cvba\u4e0d\u4e00\u6837\uff09\uff0c\u51fd\u6570\u540d(\u53c2\u6570\u53ef\u9009){\u51fd\u6570\u8bed\u53e5\u4eec}<\/li><li>\u51fd\u6570\u53ef\u4ee5\u5e26\u53c2\u6570\uff1a \u51fd\u6570\u540d(<em><strong>\u53c2\u6570\u53ef\u9009<\/strong><\/em>\uff0c<em><strong>\u9017\u53f7\u9694\u5f00<\/strong><\/em>){\u51fd\u6570\u8bed\u53e5\u4eec} <\/li><li>\u53ef\u4ee5\u8fd4\u56de\u4e00\u4e2a\u503c\u7ed9\u8c03\u7528\u5b83\u7684\u51fd\u6570\/\u6216\u8d4b\u503c\u8bed\u53e5\uff1a\u5728{\u4e2d\u4f7f\u7528return+\u53d8\u91cf\u6216\u5b57\u7b26\u4e32\/\u6570\u503c\/\u903b\u8f91\u503c}\uff0c<\/li><li>\u51fd\u6570\u5185\u58f0\u660e\u7684\u53d8\u91cf\uff0c\u4f5c\u7528\u57df\u662f\u51fd\u6570\u5185\u90e8\uff0c\u53ef\u4ee5\u5176\u4ed6\u51fd\u6570\u5185\u90e8\u58f0\u660e\u7684\u91cd\u540d\u3002\u51fd\u6570\u7ed3\u675f\uff0c\u5c31\u88ab\u5220\u9664\uff1b\u53e6\u5916\u5168\u5c40\u53d8\u91cf\u662f\u7f51\u9875\u5173\u95ed\u624d\u88ab\u5220\u9664\u3002<\/li><li>\u975e\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0c\u672a\u58f0\u660e\u53d8\u91cf\u8d4b\u503c\uff0c\u4f1a\u6210\u4e3awindow\u7684\u5c5e\u6027,\u53ef\u4ee5\u88ab\u5220\u9664\u3002\u3010\u8fd9\u91cc\u6ca1\u6709\u5b8c\u5168\u660e\u767d\u3002\u7279\u522b\u662f\u53d8\u91cf\u5220\u9664\u7684\u77e5\u8bc6\u3002\u3011<\/li><\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"js\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">function myFunction(a,b)\n{\n    return a*b;\n}\n \ndocument.getElementById(\"demo\").innerHTML=myFunction(4,3);\/\/\u8fd4\u56de\u503c\u7ed9\u8d4b\u503c\u8bed\u53e5\n\n\/\/\nvar var1 = 1; \/\/ \u4e0d\u53ef\u914d\u7f6e\u5168\u5c40\u5c5e\u6027\nvar2 = 2; \/\/ \u6ca1\u6709\u4f7f\u7528 var \u58f0\u660e\uff0c\u53ef\u914d\u7f6e\u5168\u5c40\u5c5e\u6027\n\nconsole.log(this.var1); \/\/ 1\nconsole.log(window.var1); \/\/ 1\nconsole.log(window.var2); \/\/ 2\n\ndelete var1; \/\/false \u65e0\u6cd5\u5220\u9664\n\/\/\u3010 \u7ecf\u5f20\u6052\u6d4b\u8bd5\uff1a\u65e0\u63d0\u793a\uff0c\u5982\u679c\u52a0\u4e0a\u4e25\u683c\u6a21\u5f0f\u8bed\u53e5\uff0c\u8fd0\u884c\u5230\u8fd9\u91cc\u62a5\u9519\u3011\nconsole.log(var1); \/\/1\n\ndelete var2; \nconsole.log(delete var2); \/\/ true\nconsole.log(var2); \/\/ \u5df2\u7ecf\u5220\u9664 \u62a5\u9519\u53d8\u91cf\u672a\u5b9a\u4e49<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">2.\u4f5c\u7528\u57df<\/h2>\n\n\n\n<p>JavaScript \u4f5c\u7528\u57df | \u83dc\u9e1f\u6559\u7a0b<br>https:\/\/www.runoob.com\/js\/js-scope.html<\/p>\n\n\n\n<p>\u4f5c\u7528\u57df\u5c31\u662f\u201c<strong>\u4f5c\u7528\u57df\u4e3a\u53ef\u8bbf\u95ee\u53d8\u91cf\uff0c\u5bf9\u8c61\uff0c\u51fd\u6570\u7684\u96c6\u5408\u3002<\/strong>\u201d<\/p>\n\n\n\n<ul><li>\u51fd\u6570\u5185\u58f0\u660e\u7684\u53d8\u91cf\u4f5c\u7528\u57df\u662f\u5f53\u524d\u51fd\u6570\u5185\uff0c\u51fd\u6570\u5185\u8bbf\u95ee\u4f7f\u7528\uff1b\u51fd\u6570\u6267\u884c\u5b8c\u9500\u6bc1\uff1b<\/li><li>\u51fd\u6570\u7684\u53c2\u6570\uff08\u62ec\u53f7\u5185\u7684\u53c2\u6570\u4ee5\u9017\u53f7\u9694\u5f00\u7684\uff09\u4e5f\u7b97\u5f0f\u51fd\u6570\u5185\u58f0\u660e\uff0c\u4f5c\u7528\u57df\u4e3a\u51fd\u6570\u5185\uff1b<\/li><li>\u51fd\u6570\u5916\u58f0\u660e\u7684\u53d8\u91cf\u4f5c\u7528\u57df\u662f\u5168\u5c40\uff0c\u6240\u6709\u51fd\u6570\u8868\u8fbe\u5f0f\u90fd\u53ef\u4ee5\u4f7f\u7528\uff1b\u7f51\u9875\u5173\u95ed\u9500\u6bc1\uff1b<\/li><\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"js\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">function myFunction() \n{ \n    carName = \"Volvo\";\n\/\/\u8fd9\u91cc\u8d4b\u503c\uff0c\u867d\u7136\u662f\u51fd\u6570\u5185\u7b2c\u4e00\u6b21\u51fa\u73b0\uff0c\u4f46\u662f\u5c5e\u4e8e\u975e\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0c\u672a\u58f0\u660e\u8d4b\u503c\uff0c\u6839\u636e\u4e0a\u9762\u4e00\u8282javascript\u51fd\u6570\u4e2d\u7684\u8bf4\u6cd5\uff0c\u8fd9\u662f\u5168\u5c40\u53d8\u91cf\n}\nalert(carName);\/\/\u8fd9\u91cc\u4f1a\u5f39\u7a97\u63d0\u793a\u201cVolvo\u201d\n\n\n\nfunction myFunction() \n{   var carName;\n\/\/\u8fd9\u91cc\u58f0\u660e\u662f\u5728\u51fd\u6570\u5185\uff0c\u5c5e\u4e8e\u5c40\u90e8\u53d8\u91cf\uff0c\u5916\u90e8\u65e0\u6cd5\u8bbf\u95ee\n    carName = \"Volvo\";\n\/\/\u8d4b\u503c\uff0c\n}\nalert(carName);\/\/\u8fd9\u91cc\u4f1a\u62a5\u9519<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">3.\u4e8b\u4ef6<\/h2>\n\n\n\n<p>JavaScript \u4e8b\u4ef6 | \u83dc\u9e1f\u6559\u7a0b<br>https:\/\/www.runoob.com\/js\/js-events.html<\/p>\n\n\n\n<p>\u8fd9\u91cc\u6211\u4eec\u76f4\u63a5\u590d\u5236\u83dc\u9e1f\u6559\u7a0b\u7684\u5185\u5bb9\uff1a\u5e38\u89c1\u7684HTML\u4e8b\u4ef6<\/p>\n\n\n\n<p>\u4e0b\u9762\u662f\u4e00\u4e9b\u5e38\u89c1\u7684HTML\u4e8b\u4ef6\u7684\u5217\u8868:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><th>\u4e8b\u4ef6<\/th><th>\u63cf\u8ff0<\/th><\/tr><tr><td>onchange<\/td><td>HTML \u5143\u7d20\u6539\u53d8<\/td><\/tr><tr><td>onclick<\/td><td>\u7528\u6237\u70b9\u51fb HTML \u5143\u7d20<\/td><\/tr><tr><td>onmouseover<\/td><td>\u9f20\u6807\u6307\u9488\u79fb\u52a8\u5230\u6307\u5b9a\u7684\u5143\u7d20\u4e0a\u65f6\u53d1\u751f<\/td><\/tr><tr><td>onmouseout<\/td><td>\u7528\u6237\u4ece\u4e00\u4e2a HTML \u5143\u7d20\u4e0a\u79fb\u5f00\u9f20\u6807\u65f6\u53d1\u751f<\/td><\/tr><tr><td>onkeydown<\/td><td>\u7528\u6237\u6309\u4e0b\u952e\u76d8\u6309\u952e<\/td><\/tr><tr><td>onload<\/td><td>\u6d4f\u89c8\u5668\u5df2\u5b8c\u6210\u9875\u9762\u7684\u52a0\u8f7d<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u66f4\u591a\u4e8b\u4ef6\u5217\u8868:&nbsp;<a href=\"https:\/\/www.runoob.com\/jsref\/dom-obj-event.html\">JavaScript \u53c2\u8003\u624b\u518c &#8211; HTML DOM \u4e8b\u4ef6<\/a>\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4.\u4e25\u683c\u6a21\u5f0f<\/h2>\n\n\n\n<p>JavaScript \u4e25\u683c\u6a21\u5f0f(use strict) | \u83dc\u9e1f\u6559\u7a0b<br>https:\/\/www.runoob.com\/js\/js-strict.html<\/p>\n\n\n\n<p>\u5728\u4ee3\u7801\u5f00\u59cb\u5199\u4e0a&#8221;use strict&#8221;;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e25\u683c\u6a21\u5f0f\u4e0b\u7684\u9650\u5236\uff1a<\/h3>\n\n\n\n<ul><li>\u672a\u58f0\u660e\u4e0d\u80fd\u4f7f\u7528<\/li><li>\u4e0d\u80fd\u5220\u9664\u53d8\u91cf\uff08\u5305\u62ec\u5bf9\u8c61\u548c\u51fd\u6570\uff09<\/li><li>\u4e0d\u80fd\u91cd\u547d\u540d\u53d8\u91cf<\/li><li>\u53d8\u91cf\u540d\u4e0d\u80fd\u4f7f\u7528 &#8220;eval&#8221;&#8221;arguments&#8221;\u5b57\u7b26\u4e32:<\/li><\/ul>\n\n\n\n<ol><li>\u4e0d\u80fd\u8d4b\u503c\u7ed9\u53ea\u8bfb\u5c5e\u6027\u548cgetter\u624d\u80fd\u8bbf\u95ee\u7684\u5c5e\u6027<\/li><li>\u4e0d\u5141\u8bb8\u5220\u9664\u4e00\u4e2a\u4e0d\u5141\u8bb8\u5220\u9664\u7684\u5c5e\u6027<\/li><li>\u7531\u4e8e\u4e00\u4e9b\u5b89\u5168\u539f\u56e0\uff0c\u5728\u4f5c\u7528\u57df eval() \u521b\u5efa\u7684\u53d8\u91cf\u4e0d\u80fd\u88ab\u8c03\u7528<\/li><li>\u7981\u6b62this\u5173\u952e\u5b57\u6307\u5411\u5168\u5c40\u5bf9\u8c61<\/li><\/ol>\n\n\n\n<ul><li>\u4e0d\u80fd\u4f7f\u7528\u516b\u8fdb\u5236<\/li><li>\u4e0d\u5141\u8bb8\u4f7f\u7528\u4ee5\u4e0b\u8fd9\u79cd\u8bed\u53e5:with (Math){x = cos(2)}; \/\/ \u62a5\u9519<\/li><li>\u4e0d\u5141\u8bb8\u4f7f\u7528\u8f6c\u4e49\u5b57\u7b26<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u65b0\u589e\u4fdd\u7559\u5b57<\/h3>\n\n\n\n<p>implements<br>interface<br>let<br>package<br>private<br>protected<br>public<br>static<br>yield<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f88\u4e45\u4e4b\u524d\u5de5\u4f5c\u9700\u8981\u5c31\u4f7f\u7528\u8fc7\u57fa\u7840\u7684JS\uff0c\u65ad\u65ad\u7eed\u7eed\u63a5\u89e6\uff0c\u4f46\u662f\u4e00\u76f4\u6ca1\u80fd\u7ee7\u7eed\u6df1\u5165\u3002\u9020\u6210\u7528\u5230\u7684\u65f6\u5019\u5b66\u4f1a\u4e00\u70b9\uff0c\u65f6\u95f4\u4e45\u4e00\u70b9\u5c31\u5fd8 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49,21],"tags":[],"_links":{"self":[{"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/posts\/735"}],"collection":[{"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/comments?post=735"}],"version-history":[{"count":6,"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/posts\/735\/revisions"}],"predecessor-version":[{"id":786,"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/posts\/735\/revisions\/786"}],"wp:attachment":[{"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/media?parent=735"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/categories?post=735"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/tags?post=735"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}