{"id":31950,"date":"2009-04-09T08:28:21","date_gmt":"2009-04-09T00:28:21","guid":{"rendered":"https:\/\/www.fuhaijun.com\/?p=31950"},"modified":"2010-03-20T09:16:53","modified_gmt":"2010-03-20T08:16:53","slug":"javascript-caller%e4%b8%8ecallee%e5%b1%9e%e6%80%a7-js%e5%ae%9e%e4%be%8b%e6%8a%80%e5%b7%a7-%e4%b8%ad%e5%9b%bdasp%e4%b9%8b%e5%ae%b6","status":"publish","type":"post","link":"https:\/\/www.fuhaijun.com\/?p=31950","title":{"rendered":"JavaScript caller\u4e0ecallee\u5c5e\u6027"},"content":{"rendered":"

\u00a0caller <\/strong>\u5c5e\u6027<\/strong><\/p>\n

\u8fd4\u56de\u4e00\u4e2a\u5bf9\u51fd\u6570\u7684\u5f15\u7528\uff0c\u8be5\u51fd\u6570\u8c03\u7528\u4e86\u5f53\u524d\u51fd\u6570\u3002<\/p>\n

functionName<\/em>.caller<\/strong><\/p>\n

functionName \u5bf9\u8c61\u662f\u6240\u6267\u884c\u51fd\u6570\u7684\u540d\u79f0\u3002<\/p>\n

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

\u5bf9\u4e8e\u51fd\u6570\u6765\u8bf4\uff0ccaller<\/strong> \u5c5e\u6027\u53ea\u6709\u5728\u51fd\u6570\u6267\u884c\u65f6\u624d\u6709\u5b9a\u4e49\u3002 \u5982\u679c\u51fd\u6570\u662f\u7531 JScript \u7a0b\u5e8f\u7684\u9876\u5c42\u8c03\u7528\u7684\uff0c\u90a3\u4e48 caller<\/strong> \u5305\u542b\u7684\u5c31\u662f null<\/strong> \u3002<\/p>\n

\u5982\u679c\u5728\u5b57\u7b26\u4e32\u4e0a\u4e0b\u6587\u4e2d\u4f7f\u7528 caller<\/strong> \u5c5e\u6027\uff0c\u90a3\u4e48\u7ed3\u679c\u548c functionName<\/em>.toString<\/strong> \u4e00\u6837\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u663e\u793a\u7684\u662f\u51fd\u6570\u7684\u53cd\u7f16\u8bd1\u6587\u672c\u3002<\/p>\n

\u4e0b\u9762\u7684\u4f8b\u5b50\u8bf4\u660e\u4e86 caller<\/strong> \u5c5e\u6027\u7684\u7528\u6cd5\uff1a<\/p>\n

<script>
\nfunction CallLevel(){
\n\u00a0\u00a0\u00a0 if (CallLevel.caller == null)
\n\u00a0\u00a0\u00a0 alert(“CallLevel was called from the top level.”);
\n\u00a0\u00a0\u00a0 else
\n\u00a0\u00a0\u00a0 alert(“CallLevel was called by another function:\\n”+CallLevel.caller);
\n}
\nfunction funCaller(){
\n\u00a0\u00a0 CallLevel();
\n}
\nCallLevel();
\nfunCaller()
\n<\/script><\/p>\n

callee<\/strong><\/p>\n

\u00a0\u00a0\u00a0 \u8fd4\u56de\u6b63\u88ab\u6267\u884c\u7684 \u5bf9\u8c61\uff0c\u4e5f\u5c31\u662f\u6240\u6307\u5b9a\u7684 \u5bf9\u8c61\u7684\u6b63\u6587\u3002<\/p>\n

[function<\/em>.<\/strong>]arguments.callee<\/strong><\/p>\n

\u53ef\u9009\u9879 \u53c2\u6570\u662f\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u5bf9\u8c61\u7684\u540d\u79f0\u3002<\/p>\n

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

\u5c5e\u6027\u7684\u521d\u59cb\u503c\u5c31\u662f\u6b63\u88ab\u6267\u884c\u7684 \u5bf9\u8c61\u3002<\/p>\n

\u5c5e\u6027\u662f \u5bf9\u8c61\u7684\u4e00\u4e2a\u6210\u5458\uff0c\u5b83\u8868\u793a\u5bf9\u51fd\u6570\u5bf9\u8c61\u672c\u8eab\u7684\u5f15\u7528\uff0c\u8fd9\u6709\u5229\u4e8e\u533f\u540d\u51fd\u6570\u7684\u9012\u5f52\u6216\u8005\u4fdd\u8bc1\u51fd\u6570\u7684\u5c01\u88c5\u6027<\/strong>\uff0c\u4f8b\u5982\u4e0b\u8fb9\u793a\u4f8b\u7684\u9012\u5f52\u8ba1\u7b97\u5230\u7684\u81ea\u7136\u6570\u4e4b\u548c\u3002\u800c\u8be5\u5c5e\u6027\u4ec5\u5f53\u76f8\u5173\u51fd\u6570\u6b63\u5728\u6267\u884c\u65f6\u624d\u53ef\u7528\u3002\u8fd8\u6709\u9700\u8981\u6ce8\u610f\u7684\u662f\u62e5\u6709\u5c5e\u6027\uff0c\u8fd9\u4e2a\u5c5e\u6027\u6709\u65f6\u5019\u7528\u4e8e\u9a8c\u8bc1\u8fd8\u662f\u6bd4\u8f83\u597d\u7684\u3002\u662f\u5b9e\u53c2\u957f\u5ea6\uff0c\u662f\u5f62\u53c2\u957f\u5ea6\uff0c\u7531\u6b64\u53ef\u4ee5\u5224\u65ad\u8c03\u7528\u65f6\u5f62\u53c2\u957f\u5ea6\u662f\u5426\u548c\u5b9e\u53c2\u957f\u5ea6\u4e00\u81f4\u3002<\/p>\n

\u793a\u4f8b<\/strong><\/p>\n

\/\/callee\u53ef\u4ee5\u6253\u5370\u5176\u672c\u8eab<\/p>\n

function calleeDemo() {<\/p>\n

\u00a0\u00a0\u00a0\u00a0 alert(arguments.callee);<\/p>\n

}<\/p>\n

\/\/\u7528\u4e8e\u9a8c\u8bc1\u53c2\u6570<\/p>\n

function calleeLengthDemo(arg1, arg2) {<\/p>\n

\u00a0\u00a0\u00a0 if (arguments.length==arguments.callee.length) {<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 window.alert(“\u9a8c\u8bc1\u5f62\u53c2\u548c\u5b9e\u53c2\u957f\u5ea6\u6b63\u786e\uff01”);<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return;<\/p>\n

\u00a0\u00a0\u00a0\u00a0 } else {<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 alert(“\u5b9e\u53c2\u957f\u5ea6\uff1a” +arguments.length);<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 alert(“\u5f62\u53c2\u957f\u5ea6\uff1a ” +arguments.callee.length);<\/p>\n

\u00a0\u00a0\u00a0\u00a0 }<\/p>\n

}<\/p>\n

\/\/\u9012\u5f52\u8ba1\u7b97<\/p>\n

var sum = function(n){<\/p>\n

\u00a0 if (n <= 0)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0
\n\u00a0 return 1;<\/p>\n

\u00a0 else<\/p>\n

\u00a0\u00a0\u00a0 return n \uff0barguments.callee(n – 1)<\/p>\n

}<\/p>\n

\u6bd4\u8f83\u4e00\u822c\u7684\u9012\u5f52\u51fd\u6570\uff1a<\/p>\n

var sum = function(n){<\/p>\n

\u00a0\u00a0\u00a0 if (1==n) return 1;<\/p>\n

else return n + sum (n-1);<\/p>\n

\u8c03\u7528\u65f6\uff1a\u5176\u4e2d\u51fd\u6570\u5185\u90e8\u5305\u542b\u4e86\u5bf9\u81ea\u8eab\u7684\u5f15\u7528\uff0c\u51fd\u6570\u540d\u4ec5\u4ec5\u662f\u4e00\u4e2a\u53d8\u91cf\u540d\uff0c\u5728\u51fd\u6570\u5185\u90e8\u8c03\u7528\u5373\u76f8\u5f53\u4e8e\u8c03\u7528\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\uff0c\u4e0d\u80fd\u5f88\u597d\u7684\u4f53\u73b0\u51fa\u662f\u8c03\u7528\u81ea\u8eab\uff0c\u8fd9\u65f6\u4f7f\u7528\u4f1a\u662f\u4e00\u4e2a\u6bd4\u8f83\u597d\u7684\u65b9\u6cd5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00a0caller \u5c5e\u6027 \u8fd4\u56de\u4e00\u4e2a\u5bf9\u51fd\u6570\u7684\u5f15\u7528\uff0c\u8be5\u51fd\u6570\u8c03\u7528\u4e86\u5f53\u524d\u51fd\u6570\u3002 functionName.caller f […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31950","post","type-post","status-publish","format-standard","hentry","category-default"],"_links":{"self":[{"href":"https:\/\/www.fuhaijun.com\/index.php?rest_route=\/wp\/v2\/posts\/31950"}],"collection":[{"href":"https:\/\/www.fuhaijun.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fuhaijun.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fuhaijun.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fuhaijun.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=31950"}],"version-history":[{"count":4,"href":"https:\/\/www.fuhaijun.com\/index.php?rest_route=\/wp\/v2\/posts\/31950\/revisions"}],"predecessor-version":[{"id":32915,"href":"https:\/\/www.fuhaijun.com\/index.php?rest_route=\/wp\/v2\/posts\/31950\/revisions\/32915"}],"wp:attachment":[{"href":"https:\/\/www.fuhaijun.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=31950"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fuhaijun.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=31950"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fuhaijun.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=31950"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}