javascript evalµÄ¼òµ¥Ó÷¨
js eval
evalº¯Êý½ÓÊÕÒ»¸ö²ÎÊýs£¬Èç¹ûs²»ÊÇ×Ö·û´®£¬ÔòÖ±½Ó·µ»Øs¡£·ñÔòÖ´ÐÐsÓï¾ä¡£Èç¹ûsÓï¾äÖ´Ðнá¹ûÊÇÒ»¸öÖµ£¬Ôò·µ»Ø´ËÖµ£¬·ñÔò·µ»Øundefined¡£
Àý×Ó
Ö±½ÓÔËËã
alert(eval('1+2')); // ->3
¸³Öµ
eval('var aa = 5');
alert(aa); // ->5
ÀàÐÍת»»
var yy = "{a:'aa',b:'bb'}";
yy = eval('(' + yy + ')');
alert(yy);
ÐèÒªÌØ±ð×¢ÒâµÄÊǶÔÏóÉùÃ÷Óï·¨“{}”²¢²»ÄÜ·µ»ØÒ»¸öÖµ£¬ÐèÒªÓÃÀ¨ºÅÀ¨ÆðÀ´²Å»á·µ»ØÖµ;
¶ÔÓÚ¶ÔÏóÉùÃ÷Óï¾äÀ´Ëµ£¬½ö½öÊÇÖ´ÐУ¬²¢²»ÄÜ·µ»ØÖµ¡£ÎªÁË·µ»Ø³£Óõē{}”ÕâÑùµÄ¶ÔÏóÉùÃ÷Óï¾ä£¬±ØÐëÓÃÀ¨ºÅÀ¨×¡£¬ÒÔ½«Æäת»»Îª±í´ïʽ£¬²ÅÄÜ·µ»ØÆäÖµ¡£ÕâÒ²ÊÇʹÓÃJSONÀ´½øÐÐAjax¿ª·¢µÄ»ù±¾ÔÀíÖ®Ò»¡£
×îºó»¹Òª¿¼ÂÇ×÷Ó÷¶Î§µÄÎÊÌ⣬¿ÉÒԲο¼ÒÔÏÂÍøÕ¾
http://wanyij.blog.51cto.com/46570/43794
Ïà¹ØÎĵµ£º
Êý×éÓÐËÄÖÖ¶¨ÒåµÄ·½Ê½
ʹÓù¹Ô캯Êý£º
var a = new Array();
var b = new Array(8);
var c =
new Array("first", "second", "third");
»òÕßÊý×éÖ±½ÓÁ¿£º
var d = ["first",
"second", "third"];
ÊôÐÔ
ArrayÖ»ÓÐÒ»¸öÊôÐÔ£¬¾ÍÊÇlength£¬length±íʾµ ......
// ѧϰҪÏ뿽±´ÄÇô¿ì¾ÍºÃÁË
//
// JavaScript µÄ¼Ì³ÐÊÇ»ùÓÚ prototype µÄ£¬Ã¿¸ö¶ÔÏóµÄ prototype ÊDZ£´æÔÚ¶ÔÏóµÄ __proto__ ÊôÐÔÖеģ¬Õâ¸öÊôÐÔÊÇÄÚ²¿(internal)µÄÊôÐÔ( ¹ßÀýÊÇÄÚ²¿µÄ»òÕßÒþ²ØµÄÊôÐÔÒÔ _ ¿ªÍ·)
// A prototype-based language has the notion of a prototypical object, an object used as a template ......
1. º¯ÊýÔÚÖ´ÐÐÍê return Ö¸Áîºó¾Í»áÍ£Ö¹Ö´ÐдúÂë.
function test(Num1,Num2){
return Num1+Num2;
alert(Num1+Num2); //never outputs
}
2. javascript º¯Êý²»ÄÜÖØÔØ,Ò²¾ÍÊÇ˵¿ÉÒÔÔÚͬһ¸ö×÷ÓÃÓòÖж¨Òå¶à¸öͬÃûº¯Êý,¶ø×îÖÕÖ´ÐеÄÊǺóÒ»¸öº¯Êý.
function test(num){
alert(num+10);
}
function ......
ÔÚ document ¶ÔÏóÖÐÓÐÒ»¸ö cookie ÊôÐÔ¡£µ«ÊÇ Cookie ÓÖÊÇʲô£¿“ijЩ Web Õ¾µãÔÚÄúµÄÓ²ÅÌÉÏÓúÜСµÄÎı¾Îļþ´æ´¢ÁËһЩÐÅÏ¢£¬ÕâЩÎļþ¾Í³ÆÎª Cookie¡£”—— MSIE °ïÖú¡£Ò»°ãÀ´Ëµ£¬Cookies ÊÇ CGI »òÀàËÆ£¬±È HTML ¸ß¼¶µÄÎļþ¡¢³ÌÐòµÈ´´½¨µÄ£¬µ«ÊÇ JavaScript Ò²ÌṩÁË¶Ô Cookies µÄºÜÈ«ÃæµÄ·ÃÎÊȨÀû ......
.netÖÐǰ̨javascriptÓëºǫ́c#Ï໥µ÷ÓÃ
¡¡¡¡C#´úÂëÓëjavaScriptº¯ÊýµÄÏ໥µ÷ÓÃ
¡¡¡¡ÎÊ£º
¡¡¡¡1.ÈçºÎÔÚJavaScript·ÃÎÊC#º¯Êý?
¡¡¡¡2.ÈçºÎÔÚJavaScript·ÃÎÊC#±äÁ¿?
¡¡¡¡3.ÈçºÎÔÚC#ÖзÃÎÊJavaScriptµÄÒÑÓбäÁ¿?
¡¡¡¡4.ÈçºÎÔÚC#ÖзÃÎÊJavaScriptº¯Êý?
¡¡¡¡ÎÊÌâ1´ð°¸ÈçÏ£º
¡¡¡¡javaScriptº¯ÊýÖÐÖ´ÐÐC# ......