javascript¼Ì³Ð·½Ê½Ö®¶þ
2¡¢ÔÐÍ·½Ê½Ð´À࣬ÔÐÍ·½Ê½¼Ì³Ð
core js×ÔÉíµÄ¶ÔÏóϵͳ¾ÍÊDzÉÓÃÔÐÍ·½Ê½(prototype based)¼Ì³ÐµÄ¡£»òÕß˵core
jsûÓвÉÓó£¼ûµÄÀà¼Ì³Ð(class
based)ϵͳ£¬¶øÊÇʹÓÃÔÐͼ̳ÐÀ´ÊµÏÖ×Ô¼ºµÄ¶ÔÏóϵͳ¡£¹¤×÷ÖÐÎÒÃÇÒ²¿ÉÒÔÓÃÔÐÍ·½Ê½À´ÊµÏּ̳У¬´úÂ븴ÓÃÒÔ¹¹½¨×Ô¼ºµÄ¹¦ÄÜÄ£¿é¡£
/**
* ¸¸ÀàPolygon:¶à±ßÐÎ
*
*/
function Polygon() {}
Polygon.prototype.sides = 0;
Polygon.prototype.setSides = function(s) {this.sides=s;}
/**
* ×ÓÀàTriangle:Èý½ÇÐÎ
*/
function Triangle() {}
Triangle.prototype = new Polygon();//¹Ø¼üÒ»¾ä
Triangle.prototype.getArea = function(){}
//new¸ö¶ÔÏó
var tri = new Triangle();
console.log(tri.sides);//¼Ì³ÐµÄÊôÐÔ
console.log(tri.setSides);//¼Ì³ÐµÄ·½·¨
console.log(tri.getArea);//×ÔÓз½·¨
//instanceof²âÊÔ
console.log(tri instanceof Triangle);//true£¬±íÃ÷¸Ã¶ÔÏóÊÇÈý½ÇÐÎ
console.log(tri instanceof Polygon);//true£¬±íÃ÷Èý½ÇÐÎÒ²ÊǶà±ßÐÎ
ËäÈ»´ÓÊä³ö¿ÉÒÔ¿´³ö×ÓÀà¼Ì³ÐÁ˸¸ÀàPolygonµÄÊôÐÔsidesºÍ·½·¨setSides£¬µ«sidesÊÇ0£¬Ôõô»áÊÇÈý½ÇÐÎÄØ¡£»¹µÃµ÷ÓÃÏÂ
tri.setSides(3)ʹ֮³ÉΪÈý½ÇÐΡ£ÕâÑùËÆºõºÜ²»·½±ã¡£²»ÄÜ´«²ÎÊý£¬¼´ÊÇÔÐÍ·½Ê½µÄȱµã¡£ÓŵãÊÇÕýÈ·µÄά»¤ÁË"is a"µÄ¹ØÏµ¡£
Ïà¹ØÎĵµ£º
J
SON £¨JavaScript Object Notation£©Ò»ÖÖ¼òµ¥µÄÊý¾Ý¸ñʽ£¬±Èxml¸üÇáÇÉ¡£ JSON ÊÇ JavaScript ÔÉú¸ñʽ£¬ÕâÒâζ×ÅÔÚ JavaScript Öд¦Àí JSON Êý¾Ý²»ÐèÒªÈκÎÌØÊâµÄ API »ò¹¤¾ß°ü¡£
JSONµÄ¹æÔòºÜ¼òµ¥£º ¶ÔÏóÊÇÒ»¸öÎÞÐòµÄ“‘Ãû³Æ/Öµ’¶Ô”¼¯ºÏ¡£Ò»¸ö¶ÔÏóÒÔ“{”£¨×óÀ¨ºÅ£©¿ªÊ¼£¬“ ......
1.DOMÊÇÕë¶ÔXMLµÄ»ùÓÚÊ÷µÄAPI¡£Ê¹ÓÃDOM£¬Ö»Ðè½âÎö´úÂëÒ»´ÎÀ´´´½¨Ò»¸öÊ÷µÄÄ£ÐÍ¡£ÔÚÕâ¸ö³õʼ½âÎö¹ý³ÌÖ®ºó£¬XMLÒѾÍêȫͨ¹ýDOMÄ£ÐͱíÏÖ³öÀ´£¬Í¬Ê±Ò²²»ÔÙÐèÒªÔʼµÄ´úÂë¡£
NB
£ºDOMÊÇÓïÑÔÎ޹صÄAPI£¬Ëü²¢²»ÓëJava¡¢JavaScript»òÆäËûÓïÑ԰󶨡£ ......
Cloning Nodes ½Úµã¿Ë¡
Another way of updating page contents using DOM methods is to clone existing DOM elements instead of creating new ones—in other words, using element.cloneNode() (where element is an existing node) instead of document.createElement().
&nbs ......
ÃæÏò¶ÔÏóµÄÓïÑÔ¶àÊý¶¼Ö§³Ö¼Ì³Ð£¬¼Ì³Ð×îÖØÒªµÄÓŵã¾ÍÊÇ´úÂ븴Ó㬴Ӷø¹¹½¨´óÐÍÈí¼þϵͳ¡£Èç¹ûÒ»¸öÀàÄܹ»ÖØÓÃÁíÒ»¸öÀàµÄÊôÐԺͻò·½·¨£¬¾Í³ÆÖ®Îª¼Ì³Ð¡£
´ÓÕâ¸ö½Ç¶ÈÀ´¿´¿´jsµÄ¼Ì³Ð·½Ê½¡£jsÖм̳з½Ê½ÓëдÀ෽ʽϢϢÏà¹Ø¡£²»Í¬µÄдÀ෽ʽÔì³É²»Í¬µÄ¼Ì³Ð·½Ê½¡£¸÷ÖÖÁ÷ÐÐjs¿â¼Ì³Ð·½Ê½Ò²¸÷²»Ïàͬ¡£´Ó×î¼òµ¥µÄ
¸´ÓÿªÊ¼¡£
1¡¢¹¹Ôìº ......