JS 에서 Array 와 String 방법 정리

1.var array = new Array();
2.var array = []; 
3.var array = ('a',123,ture);

tips:         
var array_1 = new Array();
array_1[0] = 'a';
array_1[1] = 10.5;
array_1[2] = true;

var array_2 = new Array(3)
array_2[0] = {x:10, y:15};
array_2[1] = document.getElementById("article");
array_2[2] = new Array();

var array_3 = new Array('a',10.5,true);
array_3[1] = 20;    //       
alert( array_3[1] );    //   ：20

var array_1 = new Array('a','b','c');
document.write（array_1.push(1,2) + '
'); // 5(                  )
document.write( array_1 );                    // a,b,c,1,2

var array_1 = new Array('a','b','c');
document.write( array_1.unshift(1,2) + '
' );  // 5(                  )
document.write( array_1 );                          //1,2,a,b,c

tips:     pop    ，      1 ，        ，        ，pop       undefined。
var array_1 = new Array('a','b','c');
document.write( array_1.pop() + '
' ); //c
document.write( array_1 ); // a, b

tips:     shift    ，     1   ，       1 ，     （     ）      1 。
        ，        ，shift       undefined。
var array_1 = new Array('a','b','c');
document.write( array_1.shift() + '
' ); //a
document.write( array_1 ); //b,c

tips:    1        2   
var array_1 = new Array('a','b','c','d');
document.write( array_1.splice(1,2) + '
' ); //b,c
document.write( array_1 );                        //a,d

tips:  num   0   start          
var array_1 = new Array('a','b','c','d');
document.write( array_1.splice(1,0,'tom') + '
' );  //(            )
document.write( array_1 ); //a,tom,b,c,d 

tips: b，c       tom
var array_1 = new Array('a','b','c','d');
document.write( array_1.splice(1,2,'tom') + '
' ); // b,c
document.write( array_1 ); //a,tom,d

tips:     array_1   
var array_1 = new Array('a','b','c','d','e');
//               
document.write( array_1.slice(1) ); //b,c,d,e
//         
document.write( array_1.slice(-1) ); //e
//         
document.write( array_1.slice(2,4) ); //c,d
//            
document.write( array_1.slice(-3,-1) ); //c,d

var array_1 = new Array('abc','xyz',234,true,'123a','  ');
array_1.sort(function(a,b){
    return a-b;   // a-b       ，b-a       
});
document.write( array_1 );//123a,234,abc,true,xyz,  

var array_1 = new Array('a','b','c');
array_1.reverse();
document.write( array_1 );  //c,b,a

var str_object = new String( str );
var str1 = String( str );
var str2 = str;
var str3 = "string";

var str = "AaBbCc";
alert( str.toLowerCase() ); // aabbcc

var str = "AaBbCc";
alert(str.toUpperCase()); //AABBCC

var str = "abcdef";
document.write( str.slice(1) + "
" );   //bcdef
document.write( str.slice(1,3) + "
" ); //bc
//         
document.write( str.slice(-2) + "
" ); //ef
document.write( str.slice(-4,-2) ); //cd