{"id":547,"date":"2017-12-11T11:57:35","date_gmt":"2017-12-11T03:57:35","guid":{"rendered":"http:\/\/zouyang1230.com\/blog\/?p=547"},"modified":"2020-10-28T22:46:57","modified_gmt":"2020-10-28T14:46:57","slug":"javascript%e6%b7%b1%e5%b1%82%e5%b7%a5%e4%bd%9c%e5%8e%9f%e7%90%86%e8%a7%a3%e6%9e%90%e4%b8%80%e5%bc%95%e6%93%8e%e3%80%81%e8%bf%90%e8%a1%8c%e7%8e%af%e5%a2%83%e3%80%81%e8%b0%83%e7%94%a8%e6%a0%88","status":"publish","type":"post","link":"http:\/\/www.imzouyang.com\/blog\/archives\/547.html","title":{"rendered":"\u5f15\u64ce\u4e0e\u73af\u5883(\u4e00):\u5f15\u64ce\u3001\u8fd0\u884c\u73af\u5883\u3001\u8c03\u7528\u6808\u7684\u6982\u89c8"},"content":{"rendered":"<h4>1\u3001\u6982\u89c8<\/h4>\n<p>\u968f\u7740javascript\u8d8a\u6765\u8d8a\u6d41\u884c\uff0c\u8d8a\u6765\u8d8a\u591a\u7684\u56e2\u961f\u5728\u5404\u79cd\u573a\u666f\u91cc\u9762\u4f7f\u7528javascript\uff0c\u524d\u7aef\u3001\u540e\u7aef\u3001hybrid apps\u3001\u5d4c\u5165\u5f0f\u8bbe\u5907\u7b49\u7b49\u3002<\/p>\n<p>\u901a\u8fc7<a href=\"http:\/\/githut.info\/\" rel=\"noopener noreferrer\" target=\"_blank\"> GitHut stats<\/a>\u6211\u4eec\u53ef\u4ee5\u770b\u51fajs\u5728\u6700\u6d3b\u8dc3github\u699c\u5355\u4e0a\u6392\u540d\u7b2c\u4e00\u3002\u8d8a\u6765\u8d8a\u591a\u7684\u9879\u76ee\u9700\u8981\u4f9d\u8d56js\uff0c\u8d8a\u6765\u8d8a\u591a\u7684\u5f00\u53d1\u8005\u6bcf\u65e5\u90fd\u4f1a\u8ddfjs\u6253\u4ea4\u9053\u3002<\/p>\n<p>\u57fa\u672c\u4e0a\u6bcf\u4e2a\u4eba\u90fd\u542c\u8bf4\u8fc7V8\u5f15\u64ce\u8fd9\u4e2a\u6982\u5ff5\uff0c\u800c\u4e14\u90fd\u77e5\u9053js\u662f\u5355\u7ebf\u7a0b\uff0c\u5e76\u4e14\u8fd0\u7528\u4e86callback\u961f\u5217\u3002\u5728\u540e\u9762\u7684\u65f6\u95f4\u91cc\uff0c\u6211\u5c06\u4f1a\u5bf9\u8fd9\u7c7b\u8bf8\u591a\u6982\u5ff5\u548c\u673a\u5236\u8fdb\u884c\u6df1\u5165\u7684\u63a2\u8ba8\u3002<\/p>\n<p>\u8fd9\u4e2a\u7cfb\u5217\u7684\u6587\u7ae0\u65e8\u5728\u6df1\u5165javascript\uff0c\u63a2\u5bfb\u5b83\u7684\u6df1\u5c42\u8fd0\u884c\u673a\u5236\u3002\u6211\u76f8\u4fe1\uff0c\u901a\u8fc7\u8ba4\u8bc6javascript\u7684\u5404\u4e2a\u529f\u80fd\u6a21\u5757\uff0c\u4ee5\u53ca\u5b83\u4eec\u662f\u5982\u4f55\u534f\u4f5c\uff0c\u6211\u4eec\u4e00\u5b9a\u4f1a\u5199\u51fa\u66f4\u597d\u7684\u4ee3\u7801\u4e0e\u5e94\u7528\u3002<\/p>\n<h4>2\u3001Javascript\u5f15\u64ce<\/h4>\n<p>\u4e00\u4e2a\u6d41\u884c\u7684js\u5f15\u64ce\uff0c\u6bd4\u5982\u8c37\u6b4c\u7684V8\u5f15\u64ce\uff0c\u5b83\u88ab\u7528\u4e8echrome\u6d4f\u89c8\u5668\u548cNode.js\u7684\u5185\u90e8\uff0c\u5f15\u64ce\u957f\u4ec0\u4e48\u6837\u5462\uff0c\u4e0b\u56fe\u662f\u4e00\u4e2a\u7b80\u5316\u7684\u4f8b\u5b50\uff1a<br \/>\n<img loading=\"lazy\" src=\"http:\/\/47.108.172.62\/blog\/wp-content\/uploads\/2017\/12\/1-OnH_DlbNAPvB9KLxUCyMsA.png\" alt=\"\" width=\"400\" height=\"300\" class=\"aligncenter size-full wp-image-548\" srcset=\"http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-OnH_DlbNAPvB9KLxUCyMsA.png 800w, http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-OnH_DlbNAPvB9KLxUCyMsA-300x225.png 300w, http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-OnH_DlbNAPvB9KLxUCyMsA-768x576.png 768w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><br \/>\n\u5f15\u64ce\u75312\u90e8\u5206\u6784\u6210\uff1a<br \/>\n\u5185\u5b58\u5806(Memory Heap)&#8212;\u8fd9\u5c31\u662f\u53d1\u751f\u5185\u5b58\u5206\u914d\u7684\u5730\u65b9<br \/>\n\u8c03\u7528\u6808(Call Stack)&#8212;\u8fd9\u5c31\u662f\u4ee3\u7801\u6267\u884c\u65f6\u6808\u5e27(Stack Frame)\u7684\u4f4d\u7f6e<\/p>\n<h4>3\u3001Runtime\u8fd0\u884c\u65f6\u73af\u5883<\/h4>\n<p>Javascript\u5f00\u53d1\u8005\u4f7f\u7528\u4e86\u8bb8\u591a\u6d4f\u89c8\u5668\u7684API (\u6bd4\u5982 \u201csetTimeout\u201d)\uff0c\u7136\u540e\u8fd9\u4e9bAPI\uff0c\u4e0d\u662f\u7531js\u5f15\u64ce\u63d0\u4f9b\u7684\u3002\u90a3\u4e48\u5b83\u4eec\u662f\u4ece\u54ea\u91cc\u6765\u7684\u5462\uff1f\u4e0b\u56fe\u662f\u4e00\u4e2a\u7b80\u5316\u8bf4\u660e\u56fe\uff1a<br \/>\n<img loading=\"lazy\" src=\"http:\/\/47.108.172.62\/blog\/wp-content\/uploads\/2017\/12\/1-4lHHyfEhVB0LnQ3HlhSs8g.png\" alt=\"\" width=\"400\" height=\"300\" class=\"aligncenter size-full wp-image-550\" srcset=\"http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-4lHHyfEhVB0LnQ3HlhSs8g.png 800w, http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-4lHHyfEhVB0LnQ3HlhSs8g-300x225.png 300w, http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-4lHHyfEhVB0LnQ3HlhSs8g-768x576.png 768w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><br \/>\n\u5de6\u8fb9\u7684\u662fjs\u5f15\u64ce\uff0c\u53f3\u8fb9\u662fweb API \u548c \u4e8b\u4ef6\u5faa\u73af\u4e0e\u56de\u8c03\u961f\u5217\u3002\u5176\u4e2d\uff0cWeb APIs \u7531\u6d4f\u89c8\u5668\u63d0\u4f9b\u7684\uff0c\u8fd9\u4e9b\u529f\u80fd\u5305\u62ec\uff1aDOM\u3001AJAX\u3001setTimeout\u7b49\u7b49\u3002<\/p>\n<h4>4\u3001\u8c03\u7528\u6808<\/h4>\n<p>js\u662f\u4e00\u4e2a\u5355\u7ebf\u7a0b\u7f16\u7a0b\u8bed\u8a00\uff0c\u610f\u5473\u7740\u5b83\u6709\u4e00\u4e2a\u5355\u4e00\u7684\u8c03\u7528\u6808\uff0c\u56e0\u6b64\u540c\u4e00\u65f6\u95f4\u53ea\u80fd\u5e72\u4e00\u4ef6\u4e8b\u3002\u8c03\u7528\u6808\u662f\u4e00\u4e2a\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u8bb0\u5f55\u4e86\u6211\u4eec\u7a0b\u5e8f\u5f53\u524d\u6267\u884c\u5230\u4ee3\u7801\u7684\u4f4d\u7f6e\u3002\u5982\u679c\u6211\u4eec\u8fd0\u884c\u4e00\u4e2a\u51fd\u6570\uff0c\u6211\u4eec\u4f1a\u5c06\u6b64\u51fd\u6570\u653e\u5230\u8c03\u7528\u6808\u7684\u6700\u9876\u90e8\uff0c\u5982\u679c\u6211\u4eecreturn\u4e00\u4e2a\u51fd\u6570\uff0c\u5c31\u628a\u6b64\u51fd\u6570\u4ece\u9876\u90e8\u79fb\u9664\uff0c\u8fd9\u5c31\u662f\u6808\u7684\u7528\u9014\u3002\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<pre><code class=\"javascript\">\nfunction multiply(x, y) {\n    return x * y;\n}\nfunction printSquare(x) {\n    var s = multiply(x, x);\n    console.log(s);\n}\nprintSquare(5);\n<\/code><\/pre>\n<p>\u5f53\u5f15\u64ce\u521a\u5f00\u59cb\u6267\u884c\u8fd9\u6bb5\u4ee3\u7801\u65f6\uff0c\u8c03\u7528\u6808\u5c06\u4f1a\u662f\u7a7a\u7684\uff0c\u4e4b\u540e\u5c06\u4f1a\u4e00\u6b65\u6b65\u6267\u884c\u5982\u4e0b\u6b65\u9aa4\uff1a<br \/>\n<img loading=\"lazy\" src=\"http:\/\/47.108.172.62\/blog\/wp-content\/uploads\/2017\/12\/1-Yp1KOt_UJ47HChmS9y7KXw.png\" alt=\"\" width=\"400\" height=\"300\" class=\"aligncenter size-full wp-image-551\" srcset=\"http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-Yp1KOt_UJ47HChmS9y7KXw.png 800w, http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-Yp1KOt_UJ47HChmS9y7KXw-300x225.png 300w, http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-Yp1KOt_UJ47HChmS9y7KXw-768x576.png 768w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><br \/>\n\u6bcf\u4e00\u4e2a\u88ab\u538b\u5165\u6808\u53bb\u6267\u884c\u7684\u4ee3\u7801\u79f0\u4e3a\u4e00\u4e2a<strong>\u6808\u5e27<\/strong>(Stack Frame)\u3002<br \/>\n\u5f53\u5f02\u5e38\u629b\u51fa\u65f6\uff0c\u5f53\u524d\u6267\u884c\u7684\u6808\u5e27(Stack Frame)\u5c06\u4f1a\u88ab\u8ffd\u8e2a\u5230\uff0c\u770b\u770b\u4e0b\u9762\u4ee3\u7801\u7684\u6267\u884c\uff1a<\/p>\n<pre><code class=\"javascript\">\nfunction foo() {\n    throw new Error('SessionStack \u5c06\u4f1a\u5e2e\u52a9\u6211\u4eec\u89e3\u51b3\u7a0b\u5e8f\u5d29\u6e83 :)');\n}\nfunction bar() {\n    foo();\n}\nfunction start() {\n    bar();\n}\nstart();\n<\/code><\/pre>\n<p>\u5982\u679c\u4e0a\u9762\u4ee3\u7801\u5728Chrome\u6d4f\u89c8\u5668\u4e0b\u6267\u884c\uff0c\u4f1a\u629b\u51fa\u5982\u4e0b\u9519\u8bef\uff0c\u5e76\u663e\u793a\u4e86\u51fa\u9519\u884c\uff1a<br \/>\n<img loading=\"lazy\" src=\"http:\/\/47.108.172.62\/blog\/wp-content\/uploads\/2017\/12\/360\u622a\u56fe20171211112408773.jpg\" alt=\"\" width=\"406\" height=\"90\" class=\"aligncenter size-full wp-image-552\" srcset=\"http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/360\u622a\u56fe20171211112408773.jpg 406w, http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/360\u622a\u56fe20171211112408773-300x67.jpg 300w\" sizes=\"(max-width: 406px) 100vw, 406px\" \/><\/p>\n<p><strong>\u201cBlowing the stack\u201d<\/strong>\u2013 \u8fd9\u4e00\u5207\u53d1\u751f\u5728\u8fbe\u5230\u8c03\u7528\u6808\u6700\u5927\u503c\u7684\u65f6\u5019\u3002\u8fd9\u79cd\u60c5\u51b5\u53ef\u80fd\u5f88\u5bb9\u6613\u53d1\u751f\uff0c\u5c24\u5176\u662f\u5f53\u4f60\u4f7f\u7528\u9012\u5f52\u5e76\u4e14\u6ca1\u6709\u5168\u9762\u5730\u6d4b\u8bd5\u8fd9\u6bb5\u4ee3\u7801\u7684\u65f6\u5019\u3002\u8ba9\u6211\u4eec\u6765\u770b\u4e0b\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n<pre><code class=\"javascript\">\nfunction foo() {\n    foo();\n}\nfoo();\n<\/code><\/pre>\n<p>\u5f53\u5f15\u64ce\u5f00\u59cb\u6267\u884c\u4e0a\u8ff0\u4ee3\u7801\u65f6\uff0c\u4f1a\u8c03\u7528foo\u51fd\u6570\uff0c\u7136\u540efoo\u51fd\u6570\u5185\u90e8\u53c8\u662f\u8c03\u7528\u7684\u5b83\u81ea\u5df1\uff0c\u6240\u4ee5\u5c31\u4f1a\u4e00\u76f4\u91cd\u590d\u8c03\u9012\u5f52\u7528\u4e0b\u53bb\u3002\u8c03\u7528\u6808\u6b64\u65f6\u4f1a\u662f\u8fd9\u4e2a\u6837\u5b50\uff1a<br \/>\n<img loading=\"lazy\" src=\"http:\/\/47.108.172.62\/blog\/wp-content\/uploads\/2017\/12\/1-AycFMDy9tlDmNoc5LXd9-g.png\" alt=\"\" width=\"600\" height=\"450\" class=\"aligncenter size-full wp-image-553\" srcset=\"http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-AycFMDy9tlDmNoc5LXd9-g.png 800w, http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-AycFMDy9tlDmNoc5LXd9-g-300x225.png 300w, http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-AycFMDy9tlDmNoc5LXd9-g-768x576.png 768w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><br \/>\n\u5728\u67d0\u4e2a\u65f6\u523b\uff0c\u51fd\u6570\u8c03\u7528\u7684\u6570\u91cf\u4f1a\u8d85\u8fc7\u8c03\u7528\u6808\u7684\u5927\u5c0f\uff0c\u6d4f\u89c8\u5668\u5c06\u4f1a\u51b3\u5b9a\u91c7\u53d6\u884c\u52a8\uff0c\u901a\u8fc7\u629b\u51fa\u4e00\u4e2a\u9519\u8bef\uff0c\u770b\u8d77\u6765\u50cf\u8fd9\u6837\uff1a<br \/>\n<img loading=\"lazy\" src=\"http:\/\/47.108.172.62\/blog\/wp-content\/uploads\/2017\/12\/1-e0nEd59RPKz9coyY8FX-uw.png\" alt=\"\" width=\"386\" height=\"21\" class=\"aligncenter size-full wp-image-554\" srcset=\"http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-e0nEd59RPKz9coyY8FX-uw.png 386w, http:\/\/www.imzouyang.com\/blog\/wp-content\/uploads\/2017\/12\/1-e0nEd59RPKz9coyY8FX-uw-300x16.png 300w\" sizes=\"(max-width: 386px) 100vw, 386px\" \/><br \/>\n\u5728\u5355\u7ebf\u7a0b\u4e2d\u8fd0\u884c\u4ee3\u7801\u53ef\u4ee5\u53d8\u5f97\u5f88\u8f7b\u677e\uff0c\u56e0\u4e3a\u4f60\u4e0d\u5fc5\u5904\u7406\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u4ea7\u751f\u7684\u590d\u6742\u573a\u666f \u2014 \u4f8b\u5982\uff0c<strong>\u6b7b\u9501<\/strong>\u3002<br 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