\u4e00\u3001this\u539f\u7406<\/strong><\/div>\n
this\u662fJavaScript\u7684\u4e00\u4e2a\u5173\u952e\u5b57\uff0c\u51fd\u6570\u8c03\u7528\u65f6\u624d\u4f1a\u51fa\u73b0;<\/p>\n
\u56e0\u4e3a\u51fd\u6570\u662f\u5728\u4e00\u5b9a\u7684\u73af\u5883\u4e2d\u8fd0\u884c\u7684\uff0c\u8c03\u7528\u51fd\u6570\u65f6\u80af\u5b9a\u9700\u8981\u77e5\u9053\u662f[\u8c01\u8c03\u7528\u7684]?\u5c31\u7528\u5230\u4e86this\u8fdb\u884c\u6307\u5411;<\/p>\n
\u90a3\u4e48this\u5230\u5e95\u6307\u5411\u7684\u662f\u4ec0\u4e48?<\/p>\n
this \u65e2\u4e0d\u6307\u5411\u51fd\u6570\u81ea\u8eab\uff0c\u4e5f\u4e0d\u6307\u51fd\u6570\u7684\u8bcd\u6cd5\u4f5c\u7528\u57df\uff0c\u800c\u662f\u8c03\u7528\u51fd\u6570\u65f6\u7684\u5bf9\u8c61!<\/p>\n
\u4e8c\u3001\u4f7f\u7528\u573a\u666f<\/strong><\/div>\n
(\u4e00)\u666e\u901a\u51fd\u6570\u7684\u8c03\u7528\uff0cthis\u6307\u5411\u7684\u662fWindow<\/strong><\/span><\/div>\n
var name = '\u5361\u5361'; \r\n\r\nfunction cat(){ \r\n var name = '\u6709\u9c7c'; \r\n console.log(this.name);\/\/\u5361\u5361 \r\n console.log(this);\/\/Window {frames: Window, postMessage: \u0192, blur: \u0192, focus: \u0192, close: \u0192, \u2026} \r\n} \r\ncat(); \r\n<\/pre>\n
\u8fd9\u91cc\u5927\u5bb6\u53ef\u80fd\u6709\u7591\u95ee\uff0c\u4e0d\u662f\u8bf4this\u6307\u5411\u7684\u662f\u8c03\u7528\u51fd\u6570\u7684\u5bf9\u8c61\u5417?cat()\u5e76\u6ca1\u6709\u5bf9\u8c61\u51fa\u73b0\u554a\uff0c\u8fd9\u4e2a\u662f\u56e0\u4e3a\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\uff0cwindow\u662f\u6839\u76ee\u5f55\uff0c\u4e00\u822c\u53ef\u4ee5\u7701\u7565\uff0c\u4f8b\u5982\uff1aalert()\u5176\u5b9e\u662f window.alert();<\/p>\n
(\u4e8c)\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0cthis\u6307\u7684\u662f\u8be5\u5bf9\u8c61<\/strong><\/span><\/div>\n
1\u3001\u4e00\u5c42\u4f5c\u7528\u57df\u94fe\u65f6\uff0cthis\u6307\u7684\u8be5\u5bf9\u8c61<\/p>\n
var name = '\u5361\u5361'; \r\nvar cat = { \r\n name:'\u6709\u9c7c', \r\n eat:function(){ \r\n console.log(this.name);\/\/\u6709\u9c7c \r\n } \r\n} \r\ncat.eat(); \r\n<\/pre>\n
\u56e0\u4e3a\u51fd\u6570eat\u662f\u7531cat\u5bf9\u8c61\u8c03\u7528\u7684\uff0c\u6240\u4ee5this\u6307\u5411\u7684\u662fcat\u672c\u8eab\uff0c\u6240\u4ee5cat.name=\u6709\u9c7c;<\/p>\n
2\u3001\u591a\u5c42\u4f5c\u7528\u57df\u94fe\u65f6\uff0cthis\u6307\u7684\u662f\u8ddd\u79bb\u65b9\u6cd5\u6700\u8fd1\u7684\u4e00\u5c42\u5bf9\u8c61<\/p>\n
var name = '\u5361\u5361'; \r\nvar cat = { \r\n name:'\u6709\u9c7c', \r\n eat1:{ \r\n name:'\u5e74\u5e74', \r\n eat2:function(){ \r\n console.log(this.name);\/\/\u5e74\u5e74 \r\n } \r\n } \r\n} \r\ncat.eat1.eat2(); \r\n<\/pre>\n
eat2\u65b9\u6cd5\u5305\u542b\u5728\u4e24\u4e2a\u5bf9\u8c61cat\u3001eat1\u4e2d\uff0c\u4f46\u662f\u7d27\u6328\u7740\u7684eat1\u5bf9\u8c61\uff0c\u6240\u4ee5this.name\u6307\u7684\u662feat1\u7684\u5c5e\u6027name\uff0c\u5373[\u5e74\u5e74]<\/p>\n
\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u4e00\u4e2a\u60c5\u51b5\uff0c\u5982\u679ccat.eat1.eat2\u8fd9\u4e2a\u7ed3\u679c\u8d4b\u503c\u7ed9\u4e00\u4e2a\u53d8\u91cfeat3\uff0c\u5219eat3()\u7684\u503c\u662f\u591a\u5c11\u5462?<\/p>\n
var eat3 = cat.eat1.eat2; \r\neat3(); \/\/ \u5361\u5361 \r\n<\/pre>\n
\u7b54\u6848\u662f[\u5361\u5361]\uff0c\u8fd9\u4e2a\u662f\u56e0\u4e3a\u7ecf\u8fc7\u8d4b\u503c\u64cd\u4f5c\u65f6\uff0c\u5e76\u672a\u53d1\u8d77\u51fd\u6570\u8c03\u7528\uff0ceat3()\u8fd9\u4e2a\u624d\u662f\u771f\u6b63\u7684\u8c03\u7528\uff0c\u800c\u53d1\u8d77\u8fd9\u4e2a\u8c03\u7528\u7684\u662f\u6839\u5bf9\u8c61window\uff0c\u6240\u4ee5this\u6307\u7684\u5c31\u662fwindow\uff0cthis.name=\u5361\u5361<\/p>\n
(\u4e09)\u6784\u9020\u51fd\u6570\u7684\u8c03\u7528\uff0cthis\u6307\u7684\u662f\u5b9e\u4f8b\u5316\u7684\u65b0\u5bf9\u8c61<\/strong><\/span><\/div>\n
var name = '\u5361\u5361'; \r\nfunction Cat(){ \r\n this.name = '\u6709\u9c7c'; \r\n this.type = '\u82f1\u77ed\u84dd\u732b'; \r\n} \r\nvar cat1 = new Cat(); \r\nconsole.log(cat1);\/\/ \u5b9e\u4f8b\u5316\u65b0\u5bf9\u8c61 Cat {name: \"\u6709\u9c7c\", type: \"\u82f1\u77ed\u84dd\u732b\"} \r\nconsole.log(cat1.name);\/\/ \u6709\u9c7c \r\n<\/pre>\n
(\u56db)apply\u548ccall\u8c03\u7528\u65f6\uff0cthis\u6307\u5411\u53c2\u6570\u4e2d\u7684\u5bf9\u8c61<\/strong><\/span><\/div>\n
var name = '\u6709\u9c7c'; \r\nfunction eat(){ \r\n console.log(this.name); \r\n} \r\nvar cat = { \r\n name:'\u5e74\u5e74', \r\n} \r\nvar dog = { \r\n name:'\u9ad8\u98de', \r\n} \r\n \r\neat.call(cat);\/\/ \u5e74\u5e74 \r\neat.call(dog);\/\/ \u9ad8\u98de \r\n<\/pre>\n
apply\u65b9\u6cd5\u548ccall\u65b9\u6cd5\u76f8\u5f53\u4e8e\u6539\u53d8\u4e86\u663e\u5f0f\u7684\u4fee\u6539\u4e86prototype\u539f\u578b<\/p>\n
$\"\"$ <\/p>\n
(\u4e94)\u533f\u540d\u51fd\u6570\u8c03\u7528\uff0c\u6307\u5411\u7684\u662f\u5168\u5c40\u5bf9\u8c61<\/strong><\/span><\/div>\n
var name = '\u5361\u5361'; \r\nvar cat = { \r\n name:'\u6709\u9c7c', \r\n eat:(function(){ \r\n console.log(this.name);\/\/\u5361\u5361 \r\n })() \r\n} \r\ncat.eat; \r\n<\/pre>\n
\u8fd9\u91cc\u63d0\u4e00\u4e0b\u533f\u540d\u51fd\u6570\u8c03\u7528\u65b9\u5f0f\uff0c\u5e38\u7528\u7684\u6709\u4e09\u79cd\u65b9\u6cd5\uff1a<\/p>\n
\/\/\u2460\u5148\u7528()\u5305\u8d77\u6765,\u7136\u540e\u518d\u540e\u9762\u8ddf (\u53c2\u6570) \r\n(function(data){ \r\n console.log(data); \r\n})(\"222\"); \r\n \r\n\/\/\u2461\u5148\u540e\u9762\u8ddf(\u53c2\u6570),\u7136\u540e\u518d()\u5305\u8d77\u6765 \r\n(function(data){ \r\n console.log(data); \r\n}(\"333\")); \r\n \r\n\/\/\u2462\u6b63\u5e38\u51fd\u6570\u683c\u5f0f\uff0c\u524d\u9762\u52a0 ! \r\n!function(data){ \r\n console.log(data); \r\n}(\"444\"); \r\n<\/pre>\n
(\u516d)\u5b9a\u65f6\u5668\u4e2d\u8c03\u7528\uff0c\u6307\u5411\u7684\u662f\u5168\u5c40\u53d8\u91cf<\/strong><\/span><\/div>\n
\u5e38\u7528\u7684\u5b9a\u65f6\u5668\u6709setInterval\u548csetTimeout\uff0c\u62ffsetInterval\u4e3e\u4f8b\u5b50\uff1a<\/p>\n
var name = '\u5361\u5361'; \r\nvar cat = setInterval(function(){ \r\n var name = '\u6709\u9c7c'; \r\n console.log(this.name);\/\/ \u5361\u5361 \r\n clearInterval(cat); \r\n},500); \r\n<\/pre>\n
\u5176\u5b9e\u5b9a\u65f6\u5668\u7684\u672c\u8d28\uff0c\u4e5f\u662f\u4e00\u79cd\u533f\u540d\u51fd\u6570\u7684\u5f62\u5f0f\u3002<\/p>\n
\u603b\u7ed3\uff1a<\/strong><\/div>\n
\u2460\u666e\u901a\u51fd\u6570\u7684\u8c03\u7528\uff0cthis\u6307\u5411\u7684\u662fwindow<\/ol>\n
\u2461\u5bf9\u8c61\u65b9\u6cd5\u7684\u8c03\u7528\uff0cthis\u6307\u7684\u662f\u8be5\u5bf9\u8c61\uff0c\u4e14\u662f\u6700\u8fd1\u7684\u5bf9\u8c61<\/ol>\n
\u2462\u6784\u9020\u51fd\u6570\u7684\u8c03\u7528\uff0cthis\u6307\u7684\u662f\u5b9e\u4f8b\u5316\u7684\u65b0\u5bf9\u8c61<\/ol>\n
\u2463apply\u548ccall\u8c03\u7528\uff0cthis\u6307\u5411\u53c2\u6570\u4e2d\u7684\u5bf9\u8c61<\/ol>\n
\u2464\u533f\u540d\u51fd\u6570\u7684\u8c03\u7528\uff0cthis\u6307\u5411\u7684\u662f\u5168\u5c40\u5bf9\u8c61window<\/ol>\n
\u2465\u5b9a\u65f6\u5668\u4e2d\u7684\u8c03\u7528\uff0cthis\u6307\u5411\u7684\u662f\u5168\u5c40\u53d8\u91cfwindow<\/ol>\n","protected":false},"excerpt":{"rendered":"
this\u662fJavaScript\u7684\u4e00\u4e2a\u5173\u952e\u5b57\uff0c\u51fd\u6570\u8c03\u7528\u65f6\u624d\u4f1a\u51fa\u73b0; \u56e0\u4e3a\u51fd\u6570\u662f\u5728\u4e00\u5b9a\u7684\u73af\u5883\u4e2d\u8fd0\u884c\u7684\uff0c\u8c03\u7528\u51fd\u6570\u65f6\u80af […]<\/p>\n","protected":false},"author":1329,"featured_media":172449,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-172443","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thread"],"acf":[],"_links":{"self":[{"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/posts\/172443","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/users\/1329"}],"replies":[{"embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/comments?post=172443"}],"version-history":[{"count":4,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/posts\/172443\/revisions"}],"predecessor-version":[{"id":172450,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/posts\/172443\/revisions\/172450"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/media\/172449"}],"wp:attachment":[{"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/media?parent=172443"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/categories?post=172443"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/tags?post=172443"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}