{"id":124,"date":"2017-01-07T10:32:43","date_gmt":"2017-01-07T02:32:43","guid":{"rendered":"http:\/\/www.qdabc.cn\/?p=124"},"modified":"2017-01-26T19:51:08","modified_gmt":"2017-01-26T11:51:08","slug":"js%e4%b8%ad%e7%9a%84call%e5%92%8capply%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"http:\/\/www.qdabc.cn\/?p=124","title":{"rendered":"JS\u4e2d\u7684call()\u548capply()\u65b9\u6cd5"},"content":{"rendered":"

JavaScript\u4e2d\u6709\u4e00\u4e2acall\u548capply\u65b9\u6cd5\uff0c\u5176\u4f5c\u7528\u57fa\u672c\u76f8\u540c\uff0c\u4f46\u4e5f\u6709\u7565\u5fae\u7684\u533a\u522b\u3002<\/p>\n

1\u3001\u65b9\u6cd5\u5b9a\u4e49<\/h4>\n

call\u65b9\u6cd5:<\/strong><\/p>\n

\u8bed\u6cd5\uff1acall([thisObj[,arg1[, arg2[,\u00a0\u00a0 [,.argN]]]]])
\n\u5b9a\u4e49\uff1a\u8c03\u7528\u4e00\u4e2a\u5bf9\u8c61\u7684\u4e00\u4e2a\u65b9\u6cd5\uff0c\u4ee5\u53e6\u4e00\u4e2a\u5bf9\u8c61\u66ff\u6362\u5f53\u524d\u5bf9\u8c61\u3002
\n\u8bf4\u660e\uff1a<\/p>\n

call \u65b9\u6cd5\u53ef\u4ee5\u7528\u6765\u4ee3\u66ff\u53e6\u4e00\u4e2a\u5bf9\u8c61\u8c03\u7528\u4e00\u4e2a\u65b9\u6cd5\u3002call \u65b9\u6cd5\u53ef\u5c06\u4e00\u4e2a\u51fd\u6570\u7684\u5bf9\u8c61\u4e0a\u4e0b\u6587\u4ece\u521d\u59cb\u7684\u4e0a\u4e0b\u6587\u6539\u53d8\u4e3a\u7531 thisObj \u6307\u5b9a\u7684\u65b0\u5bf9\u8c61\u3002
\n\u5982\u679c\u6ca1\u6709\u63d0\u4f9b thisObj \u53c2\u6570\uff0c\u90a3\u4e48 Global \u5bf9\u8c61\u88ab\u7528\u4f5c thisObj\u3002<\/p>\n

apply\u65b9\u6cd5\uff1a<\/strong><\/p>\n

\u8bed\u6cd5\uff1aapply([thisObj[,argArray]])<\/p>\n

\u5b9a\u4e49\uff1a\u5e94\u7528\u67d0\u4e00\u5bf9\u8c61\u7684\u4e00\u4e2a\u65b9\u6cd5\uff0c\u7528\u53e6\u4e00\u4e2a\u5bf9\u8c61\u66ff\u6362\u5f53\u524d\u5bf9\u8c61\u3002<\/p>\n

\u8bf4\u660e\uff1a<\/p>\n

\u5982\u679c argArray \u4e0d\u662f\u4e00\u4e2a\u6709\u6548\u7684\u6570\u7ec4\u6216\u8005\u4e0d\u662f arguments \u5bf9\u8c61\uff0c\u90a3\u4e48\u5c06\u5bfc\u81f4\u4e00\u4e2a TypeError\u3002<\/p>\n

\u5982\u679c\u6ca1\u6709\u63d0\u4f9b argArray \u548c thisObj \u4efb\u4f55\u4e00\u4e2a\u53c2\u6570\uff0c\u90a3\u4e48 Global \u5bf9\u8c61\u5c06\u88ab\u7528\u4f5c thisObj\uff0c \u5e76\u4e14\u65e0\u6cd5\u88ab\u4f20\u9012\u4efb\u4f55\u53c2\u6570\u3002<\/p>\n

 <\/p>\n

2\u3001\u5e38\u7528\u5b9e\u4f8b<\/h4>\n

a<\/strong><\/p>\n

function\u00a0add(a,\u00a0b)\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0alert(a\u00a0+\u00a0b);\r\n}\r\n\r\nfunction\u00a0sub(a,\u00a0b)\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0alert(a\u00a0-\u00a0b);\r\n}\r\n\r\nadd.call(sub,\u00a03,\u00a01);<\/pre>\n
\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u7684\u610f\u601d\u5c31\u662f\u7528 add \u6765\u66ff\u6362 sub\uff0cadd.call(sub,3,1) == add(3,1) \uff0c\u6240\u4ee5\u8fd0\u884c\u7ed3\u679c\u4e3a\uff1aalert(4); \/\/ \u6ce8\u610f\uff1ajs \u4e2d\u7684\u51fd\u6570\u5176\u5b9e\u662f\u5bf9\u8c61\uff0c\u51fd\u6570\u540d\u662f\u5bf9 Function \u5bf9\u8c61\u7684\u5f15\u7528\u3002<\/p>\n
 <\/p>\n
b<\/strong><\/p>\n
function\u00a0Animal()\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0this.name\u00a0=\u00a0\"Animal\";\r\n\u00a0\u00a0\u00a0\u00a0this.showName\u00a0=\u00a0function()\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0alert(this.name);\r\n\u00a0\u00a0\u00a0\u00a0}\r\n}\r\n\r\nfunction\u00a0Cat()\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0this.name\u00a0=\u00a0\"Cat\";\r\n}\r\n\r\nvar\u00a0animal\u00a0=\u00a0new\u00a0Animal();\r\nvar\u00a0cat\u00a0=\u00a0new\u00a0Cat();\r\n\r\n\/\/\u901a\u8fc7call\u6216apply\u65b9\u6cd5\uff0c\u5c06\u539f\u672c\u5c5e\u4e8eAnimal\u5bf9\u8c61\u7684showName()\u65b9\u6cd5\u4ea4\u7ed9\u5bf9\u8c61cat\u6765\u4f7f\u7528\u4e86\u3002\r\n\/\/\u8f93\u5165\u7ed3\u679c\u4e3a\"Cat\"\r\nanimal.showName.call(cat,\u00a0\",\");\r\n\/\/animal.showName.apply(cat,[]);<\/pre>\n
 <\/p>\n
c\u5b9e\u73b0\u7ee7\u627f<\/strong><\/p>\n
function\u00a0Animal(name)\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0this.name\u00a0=\u00a0name;\r\n\u00a0\u00a0\u00a0\u00a0this.showName\u00a0=\u00a0function()\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0alert(this.name);\r\n\u00a0\u00a0\u00a0\u00a0}\r\n}\r\n\r\nfunction\u00a0Cat(name)\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0Animal.call(this,\u00a0name);\r\n}\r\n\r\nvar\u00a0cat\u00a0=\u00a0new\u00a0Cat(\"Black\u00a0Cat\");\r\ncat.showName();<\/pre>\n
Animal.call(this) \u7684\u610f\u601d\u5c31\u662f\u4f7f\u7528 Animal\u5bf9\u8c61\u4ee3\u66ffthis\u5bf9\u8c61\uff0c\u90a3\u4e48 Cat\u4e2d\u4e0d\u5c31\u6709Animal\u7684\u6240\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\u4e86\u5417\uff0cCat\u5bf9\u8c61\u5c31\u80fd\u591f\u76f4\u63a5\u8c03\u7528Animal\u7684\u65b9\u6cd5\u4ee5\u53ca\u5c5e\u6027\u4e86.<\/p>\n
 <\/p>\n
d\u591a\u91cd\u7ee7\u627f<\/strong><\/p>\n
function\u00a0Class10()\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0this.showSub\u00a0=\u00a0function(a,\u00a0b)\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0alert(a\u00a0-\u00a0b);\r\n\u00a0\u00a0\u00a0\u00a0}\r\n}\r\n\r\nfunction\u00a0Class11()\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0this.showAdd\u00a0=\u00a0function(a,\u00a0b)\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0alert(a\u00a0+\u00a0b);\r\n\u00a0\u00a0\u00a0\u00a0}\r\n}\r\n\r\nfunction\u00a0Class2()\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0Class10.call(this);\r\n\u00a0\u00a0\u00a0\u00a0Class11.call(this);\r\n}<\/pre>\n
\u5f88\u7b80\u5355\uff0c\u4f7f\u7528\u4e24\u4e2a call \u5c31\u5b9e\u73b0\u591a\u91cd\u7ee7\u627f\u4e86 \u5f53\u7136\uff0cjs\u7684\u7ee7\u627f\u8fd8\u6709\u5176\u4ed6\u65b9\u6cd5\uff0c\u4f8b\u5982\u4f7f\u7528\u539f\u578b\u94fe\uff0c\u8fd9\u4e2a\u4e0d\u5c5e\u4e8e\u672c\u6587\u7684\u8303\u7574\uff0c\u53ea\u662f\u5728\u6b64\u8bf4\u660ecall \u7684\u7528\u6cd5\u3002\u8bf4\u4e86call \uff0c\u5f53\u7136\u8fd8\u6709 apply\uff0c\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u57fa\u672c\u4e0a\u662f\u4e00\u4e2a\u610f\u601d\uff0c\u533a\u522b\u5728\u4e8e call \u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u53ef\u4ee5\u662f\u4efb\u610f\u7c7b\u578b\uff0c\u800capply\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5fc5\u987b\u662f\u6570\u7ec4\uff0c\u4e5f\u53ef\u4ee5\u662farguments \u8fd8\u6709 callee\uff0ccaller..<\/p>\n
\u6b22\u8fce\u5206\u4eab\u672c\u6587\uff0c\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u51fa\u5904\uff1a\u524d\u7aefABC<\/a> » JS\u4e2d\u7684call()\u548capply()\u65b9\u6cd5<\/a><\/p>","protected":false},"excerpt":{"rendered":"
JavaScript\u4e2d\u6709\u4e00\u4e2acall\u548capply\u65b9\u6cd5\uff0c\u5176\u4f5c\u7528\u57fa\u672c\u76f8\u540c\uff0c\u4f46\u4e5f\u6709\u7565\u5fae\u7684\u533a\u522b\u3002 1\u3001\u65b9\u6cd5\u5b9a\u4e49 call\u65b9\u6cd5: \u8bed\u6cd5\uff1acall([thisObj[,arg1[, arg2[,\u00a0\u00a0 [,.arg […]<\/p>\n","protected":false},"author":1,"featured_media":87,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[22,21,9],"_links":{"self":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/124"}],"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=124"}],"version-history":[{"count":1,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/124\/revisions"}],"predecessor-version":[{"id":125,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/124\/revisions\/125"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/media\/87"}],"wp:attachment":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=124"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=124"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=124"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}