Javascriptѧϰ±Ê¼ÇÒ» ¶ÔÏó
¼ìË÷:
1 ÓÃ||À´Ìî³äĬÈÏÖµ
var status = flight.status || "unknown";
2 ʹÓÃ&&·ÀÖ¹TypeError
flight.equipment.model //throw "TypeError"
flight.equipment && flight.equipment.model //undefined
ÒýÓÃ
var a={},b={},c={};
document.writeln(a===b); //false
ÔÐÍ
JavascriptÌṩµÄʵÏÖ»úÖÆ£º
var stooge = {
"first-name":"Jerome",
"last-name":"Howard"
};
var temp = function(){};
temp.prototype=stooge;
var another_stooge= new temp;
¿ÉÒÔÖ±½Ó¸øObject¼Ó¸ö·½·¨À´¼ò»¯
if (typeof Object.beget !== 'function'){
Object.beget = function (o){
var F = function (){};
F.prototype = o;
return new F();
}
}
var another_stooge =Object.beget(stooge);
another_stooge["first-name"] = 'Harry';
document.writeln(another_stooge["first-name"]); //Harry
document.writeln(another_stooge["last-name"]); //Howard
document.writeln(stooge["first-name"]); //Jerome
·´Éä
typeof¿ÉÒÔ·ÃÎÊÔÐÍÁ´
document.writeln(typeof flight.toString); //function
hasOwnPropertyÔò²»ÐÐ
document.writeln(flight.hasOwnProperty('toString')); //false
ö¾Ù
ʹÓÃfor inö¾ÙÊôÐÔ µÄ˳ÐòÊDz»È·¶¨µÄ£¬¶øÇÒÐèҪʹÓÃhasOwnProperty£¬²¢Ê¹ÓÃtypeofÅųýº¯Êý
×îºÃ
var properties = [
"first-name",
"last-name"
];
for (var i = 0; i < properties.length; i+=1){
document.writeln(properties[i] + ": " + stooge[properties[i]]);
}
ɾ³ý
ɾ³ý²»»á´¥¼°ÔÐÍÁ´£¬É¾³ý¶ÔÏóÊôÐÔ£¬ÔÐÍÁ´µÄÊôÐÔ¸¡ÏÖ³öÀ´
anothet_stooge["first-name"] = "Jack";
document.writeln(anothet_stooge["first-name"]);//Jack
delete anothet_stooge["first-name"];
document.writeln(anothet_stooge["first-name"]);//Jerome
ÃüÃû¿Õ¼ä
var MYAPP= {}£»
MYAPP.stooge = {
//...
};
Ïà¹ØÎĵµ£º
ÓÐÁËÇ°ÃæµÄһƪÎÄÕ¡¶ÔÚ Wordpress ²å¼þÖÐʹÓÃÑùʽ±í¡·£¬Ôò±¾½Ú¡¶ÔÚ WP ²å¼þÖÐʹÓà Javascript¡·¾ÍºÃÃèÊö£¬Ò²ÈÝÒ×Àí½âµÄ¶àÁË¡£
1£¬²å¼þµÄÎļþ¼Ð½á¹¹ÓëǰÎÄÏàͬ¡£²å¼þÍê³ÉµÄ¹¦ÄÜǰÎÄÒѾÊö¼°£¬±¾½Ú½«¼ÓÒ»¸ö¹¦ÄÜ£¬µ±ÔÚÎÄ×ÖÉϵã»÷ʱ£¬µ¯³öÒ»¸ö´°¿Ú¡£±¾½ÚʾÀýÒ²ÔÚǰÎÄʾÀýµÄ»ù´¡ÉÏ¿ª·¢¡ ......
»¹²»Á˽âJSONÊÇʲô?¿´ÁËÏÂÃæÕâÆªÎÄÕ£¬Äú¶ÔJSONÊÇʲôӦ¸ÃÄܹ»ÓÐÁËÒ»¸ö±È½ÏÇåÎúµÄ¸ÅÄî¡£
¡¡¡¡JSON ¼´ JavaScript. Object Natation£¬ËüÊÇÒ»ÖÖÇáÁ¿¼¶µÄÊý¾Ý½»»»¸ñʽ£¬·Ç³£ÊʺÏÓÚ·þÎñÆ÷Óë JavaScript. µÄ½»»¥¡£±¾ÎĽ«¿ìËÙ½²½â JSON ¸ñʽ£¬²¢Í¨¹ý´úÂëʾÀýÑÝʾÈçºÎ·Ö±ðÔÚ¿Í»§¶ËºÍ·þÎñÆ÷¶Ë½øÐÐ JSON ¸ñʽÊý¾ÝµÄ´¦Àí¡£
¡¡¡¡¾¡¹ ......
Õâ¸öЧ¹ûÓ¦¸Ã²»ËãÊ²Ã´Ï¡Ææ£¬ÍøÉÏÒ²ÓÐÏֳɵĴúÂ룬ÎÒÕâ¸öÒ²Ã»Ê²Ã´ÌØ±ðµÄµØ·½£¬Ö»ÊÇÒòΪÎÒ×Ô¼ºÐ´µÄ£¬Ò²ËãÊÇΪѧϰDOMºóÒ»¸öÁ·Ï°£»ÔÚIEϲâÊÔͨ¹ý£»
ʵÏÖЧ¹ûÊÇÕâÑùµÄ£º
¶ÁÈ¡XMLÎĵµ£»
²ÉÓõݹéÉú³ÉÎÞÏÞ¼¶µÄÊ÷Ðβ˵¥£»
Äܹ»ÏìÓ¦Êó±êʼþ£¬Õ¹¿ªÓë²ðµþ×Ó¼¶²Ëµ¥£»
Ê×ÏÈÊÇÉú³ÉÒ»¸öXMLÎĵµ£¬ÎÒÓõÄÊÇXML SpyµÄ±à¼Æ÷£»
< ......
³£ÓÃ:javascript×Ö·û´®º¯Êý ÊÕ²Ø
concat
½«Á½¸ö»ò¶à¸ö×Ö·ûµÄÎı¾×éºÏÆðÀ´£¬·µ»ØÒ»¸öеÄ×Ö·û´®¡£
var a = "hello";
var b = ",world";
var c = a.concat(b);
alert(c);
//c = "hello,world"
indexOf
·µ»Ø×Ö·û´®ÖÐÒ»¸ö×Ó´®µÚÒ»´¦³öÏÖµÄË÷Òý£¨´Ó×óµ½ÓÒËÑË÷£©¡£Èç¹ûûÓÐÆ¥ÅäÏ·µ»Ø -1 ¡£
var index1 = a.indexOf ......
´´½¨ÎĵµÔªËØ
document.createElement(nodename)
²åÈëÔªËØµ½Îĵµ½ÚµãÊ÷
parent.appendChild(child)
´´½¨Îı¾½Úµã
document.createTextNode(text)
ÔÚÏÖÓÐÔªËØÇ°²åÈëÐÂÔªËØ
parentElement.insertBefore(newElement,targetElement)
ÔÚÏÖÓÐÔªËØºó²åÈëÐÂÔªËØ£¨×ԱຯÊý£©
parentElement.insertAfter(newElement,targe ......