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JavaScriptÖеÄObjectÊÇÒ»×éÊý¾ÝµÄkey-valueµÄ¼¯ºÏ, ÓеãÀàËÆÓÚJavaÖеÄHashMap, ËùÓÐÕâЩÊý¾Ý¶¼ÊÇObjectÀïµÄproperty.
ͨ³£Çé¿öÏÂ, JavaScriptÖн¨Á¢Ò»¸ö¶ÔÏóÓÃ"new"¼ÓÉÏconstructor functionÀ´ÊµÏÖ.
Èçnew Date(), new Object()µÈ.
var book = new Object();
book.name = "JavaScript is Cool";
book.author = "tom";
book.pages = 514;
ÉÏÃæÀý×ÓÖеÄnameºÍpage¾ÍÊÇÃûΪbookµÄ¶ÔÏóÖеÄproperty.
ÎÒÃÇ¿ÉÒÔÓÃdeleteÀ´É¾³ýObjectÖеÄproperty: "delete book.name;".
³ýÁËObject, DateµÈbuildinµÄ¶ÔÏóÍâ, ÎÒÃÇ¿ÉÒÔд×Ô¼ºµÄconstructor function, È»ºóʹÓÃnew¾Í¿ÉÒÔ½¨Á¢×Ô¼ºµÄ¶ÔÏó. ÈçÉÏÃæµÄbook¿ÉÒÔд³É:
function Book (name, author, page) {
this.name = name;
this.author = author;
this.page = page;
}
var abook = new Book("JavaScript is Cool", "tom", 514);
¶þ. functionµÄÓ÷¨
ÔÚJavaScriptÖÐ, functionÊÇÒ»ÖÖÊý¾ÝÀàÐÍ, ËùÓеÄfunction¶¼ÊÇ´ÓbuildinµÄFunction object ÑÜÉúµÄ¶ÔÏó.
ËùÒÔÔÚJavaScript ÖÐfunction¿ÉÒÔ×÷Ϊ²ÎÊý´«µÝ, ¿ÉÒÔ×÷ΪObjectµÄproperty, Ò²¿ÉÒÔµ±×÷º¯Êý·µ»ØÖµ.
functionÔÚJavaScriptÖÐÓÐÁ½ÖÖÓ÷¨,
Ò»ÖÖÊǵ±×÷constructor, Ç°Ãæ¼ÓÉÏnew keywordÓÃÀ´½¨Á¢¶ÔÏó. Ò»ÖÖÊǵ±×÷method, ΪÆäËû¶ÔÏóµ÷ÓÃ.
×¢ÒâfunctionºÍmethodÔÚÖÐÎÄÀïµÄÒâ˼Ï൱, ÔÚÓÐЩÓïÑÔÀïÒ²¿ÉÒÔͨÓÃ.
µ«ÊÇÔÚJavaScriptÖÐ, ËüÃÇ»¹ÊÇÓÐËùÇø±ðµÄ.
function±¾ÉíÊÇÒ»¸ö¶ÔÏó, ¶øµ±×÷Ϊһ¸ö·½·¨ËûÊôÓÚÒ»¸ö¶ÔÏóʱ, ¾Í³ÉΪÁËÒ»¸öÕâ¸ö¶ÔÏóµÄmethod, Ï൱ÓÚÒ»¸ö¶ÔÏóÖÖµÄÊôÐÔ.
Ò²¾ÍÊÇ˵methodÊÇÏà¶ÔÓÚÒ»¸ö¶ÔÏó¶øÑÔµÄ, functionÔÚijЩÇé¿öϳÉΪÁËÒ»¸ö¶ÔÏóµÄmethod.
function Book(name, author, page) {
this.name = name;
this.author = author;
this.page = page;
this.getReader = Book_getReader;
}
function Book_getReader() {
//....
}
ÉÏÃæµÄÀý×ÓÖÐ, function Book_getReader()¾Í³ÉΪÁËBookµÄÒ»¸öÃûΪgetReaderµÄmethod.
call()ºÍapply()ÊÇFunction object µÄÁ½¸ö·½·¨,
ËüÃÇÒ²¿ÉÒÔʹһ¸öfunction×÷ΪÁíÒ»¸ö¶ÔÏóµÄmethodÀ´µ÷ÓÃÓÃ.
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