Javascript Óï·¨½²½â

1.delete ÔËËã·û
¶ÔÏóɾ³ýÒ»¸öÊôÐÔ£¬»òÊý×éÖÐɾ³ýÒ»¸öÔªËØ¡£½«ÎÞÓõÄÄÚÈÝɾ³ýÒÔ½ÚÊ¡¿Õ¼ä¡£
delete expression
example:
  var person = new Object();
  person.sex = "male";
  alert(person.sex);
  delete person.sex;
  alert(person.sex);
2. ‘,' ÔËËã·û
  var a = 2;
  var b = 3;
  var c = (a++,b++,a+b);
  alert(c); // 7
3.for each ...in,±éÀú¶ÔÏóÊôÐÔµÄÖµ»òÊý×éµÄÔªËØ
//´´½¨¶ÔÏó ÓÃ{}´´½¨Ò»¸öжÔÏ󣬲¢ÓÃÖ¸¶¨µÄ¼üºÍÖµ³õʼ»¯¸Ã¶ÔÏó.
var myObject = {hisName:"javascript",age:11,belonging:"Mozilla"};
for each ( var item in myObject){
   document.write(item);
}
4. withÓï¾ä , ¿ÉÒÔ·½±ãµØÒýÓÃij¸öÌض¨¶ÔÏóµÄ·½·¨ºÍÊôÐÔ
Óï·¨¸ñʽ£º
with(object){
  statement(s);
}
 example:
   var rightNow = new Date();
   with(rightNow){
      document.write(getDay());
   }
  »ò
   var rightNow = new Date();
   document.write(rightNow.getDay());
with£ºÊ¡ÂÔÁËrightNow¡£
5¡£functionÄäÃûº¯Êý£¬ÕâÖÖº¯Êý½«Ò»¶Î“º¯ÊýÎı¾”´æ´¢ÔÚÒ»¸ö±äÁ¿ÖÐ.Ö»ÄÜÔÚÃüÃûÖ®ºó£¬²Å¿ÉʹÓÃ.
Óï·¨:
    var myFunc = function(arg_1,arg_2,arg_3,....,arg_n){
           //Ö´ÐÐÓï¾ä
           return  "һЩÊý¾Ý»ò±äÁ¿";
    }
º¯ÊýÎı¾Ò²¿É×÷Ϊº¯Êý»ò·½·¨µÄ²ÎÊý
var yourname = "zhoubc";
afunc(function(){document.write(yourname);},200);
6.Object Àà
¹¹Ô췽ʽ
  1.var obj_object = new Person(parameter);
       function Person(parameter){
      }
   2.var obj_object = {ÊôÐÔÃû£ºÊôÐÔÖµ,...ÊôÐÔÃû:ÊôÐÔÖµ}
»ùÀà
´´½¨ÀàµÄʵÀý
var person = new Object();
person.sex = "male";
person.age = 28;
person.birthday = new Date(1970,0,1);
»ò
var person = {sex:"male",age:28,birthday:new Date(1970,0,1)};
´òÓ¡
for(var i in person){
  document.write(person[i]);
}