
򣨼Զۻã

<script>

var price=100;
var count=prompt("");
var pay=prompt("븶");
var total=price*count;
var change=pay-total;

alert("Ӧ "+total+" , "+change;);

</script>


ϰ

1if

       if(){ ִеĴ }
------------------------------------------------

       if(){
           
	    ִеĴ
       
        }else{
       
            ִеĴ

        }
-----------------------------------------

       if(1){
           
	    1ִеĴ
       
        }else if(2){
       
            1㣬2ִеĴ

        }else if(...){

	    .....
	
	}else{

	    㣬ִеĴ	
	}
-------------------------------------------

2ϵ

> >= < <= == != === !==

3ϵ   ֵ true false


¿Σwhileѭ  

1while( ʽ ){ ѭִеĴ }

ΪtrueѭԶһfalseѭִ

ǿѭbreak


isNaN()  ----true



飺
var zm=['òǮ','','','...',''];

zm[0]     'òǮ'
zm[1]     ''
zm[2]     ''
zm[3]     '...'
zm[4]     ''

zm.length  鳤



















