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function sendMessage(msg,obj){
// Èç¹ûÏûÏ¢ºÍ¶ÔÏóµÄ²ÎÊý¶¼±»Ìṩ
if(arguments.length == 2){
// ¸ø¶ÔÏó·¢ËÍÏûÏ¢
obj.handleMsg(msg);
}else
alert(msg); // ·ñÔò½öÏÔʾĬÈϵĴíÎóÐÅÏ¢
}
sendMessage("hello world!"); // ½ö´«µÝÒ»¸ö²ÎÊý£¬ÏÔʾ´íÎóµÄÌáʾÐÅÏ¢
// Êä³ö½á¹ûΪ£º¾¯Ê¾¿ò hello world
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sendMessage("how are you?" , {
handleMsg: function(msg) {
alert("This is a custom message:" + msg);
}
});
// Êä³ö½á¹ûΪ£º¾¯Ê¾¿ò This is a custom message how are you?
/*
var obj = new Object();//´´½¨Ò»¸öжÔÏó²¢½«Æä´æ·ÅÔÚobjÀï 
obj.val = 5;           //½«¸Ã¶ÔÏóµÄһЩÊôÐÔÉèÖóɲ»Í¬µÄÖµ 
obj.click = function(){ 
alert( "hello" ); 
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click: function(){ 
alert( "hello" ); 

}; 
*/
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{
return ;
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var a = "hello";
var b = ",world";
var c = a.concat(b);
alert(c);
//c = "hello,world"
indexOf
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