Java Web基礎知識day 03——javascript知識

JavaScript         ，       、   、       ，
	      。        JavaScript  ，        ，            
    :
	ECMAScript:js    (                  ...)
	BOM:       
	DOM:      
  :
	  html     
	  html   
	       
  :
	js         ,       
	js        .js
js html  
	  1:       
		 js        ,    head   
	  2:   js  
		  script   src    
js     :
	var    =    ;
	var    ;
		   =    ;
	  :
		var           
		        ,          ,      
js     :
	    :(5 )
		Null
		String
		Number
		Boolean
		Undefined
		   typeof                      ,       ,               
			typeof   | ;
		    null,  typeof     object
		
		  typeof    
			undefined -       Undefined     
			boolean -       Boolean     
			number -       Number     
			string -       String     
			object -              Null     

	    :
//
js:      
	      :
		  1:
			function    (  ){
				   ;
			}
		  :            
			        
			       
				   (  )
js    :
	     :
		  :  onclick
		    : onsubmit   form     onsubmit="return    ()"          boolean  
		    : onload
		    :★
			onfocus
			onblur
		    :★
			onsubmit
			onchange   
		      :★
			onload
		
		    (  )
			onclick
		    (  )
			ondblclick:  
			onmousedown:  
			onmouserup:  
			onmousemove:  
			onmouserover:  
			onmouserout:  
		    (  )
			onkeydown:  
			onkeyup:  
			onkeypress:  
		
js        :
	  1:
		            
js    :
	  1:
		var obj=documnet.getElementById("id ");
     value 
	obj.value;
            
	obj.innerHTML;

     :
	  1:
		function    (  ){
			   ;
		}	
	
	  2:
		var    =function(  ){
			   ;
		}
		
js        :
	  1:
		            
	  2:
		       
			document.getElementById("id ").onclick=function(  ){....}
			document.getElementById("id ").onclick=   
		  :
			                 
		a.   2 js    html      
		b.              2 js    onload  .

bom window        
   :
	var id=setInterVal(code,   ):                 
	var id=setTimeout(code,   ):                  
	
	     :
		clearInterval(id);
		claerTimeout(id);
String  
	     String            String      
	substring(0,endIndex);

  :
	   :
		     : > >= < <=
		         java  
		      ,            ,                      3>"2"
		      ,       ,    false   3>"hello"
		          ,  ascii
	      == ===
		== :        
		===:        ,          
  :
	if    java  
	for while    java  
	switch  java  (  ,switch       .       )
/



  :  
	1.css html  
		  3  
	2.css    :
		id class   
		      
	3.js
		js html  
			    
	4.    
	5.    
		2   
	6.  
		onclick onload onsubmit
	7.        
		2   
	8.    2 
	9.for while if
bom(       )  
	        5   
		window:  
		location:     (   )
		history:  
window    :
	        （frame   iframe   ），      HTML        window   ，
	              window   。
	     :
		  window           
			window.location     location
			window.history     history
			...
	     
		   
			alert("...."):   
			confirm("       ?"):       :boolean
			prompt("       "):       :      
		   
			     
				setInterval(code,   ):    
				setTimeout(code,   ):             .
				
				  :
					setInterval(showAd,4000);
					serInterval("showAd()",4000);
			
			     
				clearInterval(id):
				clearTimeout(id):
		     
			open(url):  
			close():  
location:    	
	    :
		href:           url(    )
		
		location.href;   url
		location.href="...";  url     a  
history:  
	back();  
	forward():  
	★go(int)
		go(-1)     back()
		go(1)     forward()
dom(      )
	       html     ,                ,     (document )
	  (Node)
		     document
		     element
		     attribute
		     text
	    :
		  document        :
			    :
				document.getElementById("id "):         
				document.getElementsByTagName("   "):           (  )
				document.getElementsByClassName("class    "):  class        (  )
				document.getElementsByName("name    "):  name        (  )
		         value  
			dom  .value;  
			dom  .value="";  
		            
			dom  .innerHTML;  
			dom  .innerHTML="";  
		      style  
			dom  .style.  ;  
			dom  .style.  ="";  
		        
			dom  .  
/
  htmldom     js  htmldom         xml dom
	          xml dom  document 
	          xml dom  element 
		appendChild(dom  ):          
  :
	  :
		new Array();//   0
		new Array(size);//     
		new Array(e1,e2..);//    
		   
			var arr4=["aa","bb"];
	    :
		length
	  :
		      
		         
	    :(  )
		   :      
			pop(): 	    
			push():      
			
			shift():     
			unshift():     
		    :
			join(   ):                 
		    :
			concat():          ，     。
		      :
			sort();  
			reverse();  
      :
	      String Number Boolean     ,         
	Array:  
	String:
		  :
			new String( |  );//      
			String( |  );//      
		    :
			substring(start,end):[start,end)
			substr(start,size):                
			
			charAt(index):          。
			indexOf(""):         
			
			replace():  
			split():  
			
		    :length	
	Boolean:
		  :
			new Boolean( |  );
			Boolean( |  );
			 0                true
	Number
		  :
			new Number( |  );
			Number( |  );
		  :
		
			null====>0 
			fale====>0 true====>1
			      =====>     
			   NaN
	Date:
		new Date();
		    :
			toLocalString()
	RegExp:     
		  :
			       /     /  
			       /     /
			
			new RegExp("     ")
			new RegExp("     ","  ") 
			  :
				i:     
				g:  
			    :
				test() :    boolean
	Math:
		Math.  |  
		Math.PI
		Math.random()  [0,1)
		
	  :
		★
		decodeURI()         URI。 
		encodeURI()         URI。

		Number():       
		String():     
		
		parseInt():       
		parseFloat():       
		
		eval()    JavaScript    ，            。