°´Ã¼ ÇÁ·ÎÆÛƼ´Â ·ç¾ÆÀÇ Å×À̺í°ú ºñ½ÁÇÏ´Ù.°´Ã¼ »ý¼º°´Ã¼´Â Å°¿Í °ªÀ¸·Î ³ªÅ¸³½´Ù.°´Ã¼ »ý¼ºÀº ¸î°¡Áö ¹æ¹ýÀÌ ÀÖ´Ù. 1) »ý¼º var myColor = {
red: 0, blue: 1, green: 2, 'red blue' : 33, //°ø¹éÀÌ ÀÖ´Â ¹®ÀÚ¿µµ °¡´É 'red green' : 44 //°ø¹éÀÌ ÀÖ´Â ¹®ÀÚ¿Àº Color['red blue']ó·³ »ç¿ëÇÑ´Ù. }; °ø¹éÀÌ ÀÖ´Â ¹®ÀÚ¿µµ °¡´ÉÇÏ´Ù. 2) »ý¼º var obj = {};
obj.color = 'blue'; obj.width = 34; obj['height'] = 100; 3) »ý¼º var obj = new Object();
obj.color = 'blue'; obj.width = 34; obj['height'] = 100; °´Ã¼ ¼Ó¼º ¸®½ºÆ®°´Ã¼ ÇÁ·ÎÆÛƼ ¸®½ºÆ®¸¦ for ±¸¹®À¸·Î °¡Á®¿Ã¶§´Â for ~ in ±¸¹®À» »ç¿ëÇØ¾ß ÇÑ´Ù.Object.keys ÇÔ¼ö´Â ¹è¿À» ¹ÝȯÇϹǷΠfor ~ of ±¸¹®À» »ç¿ëÇØ¾ß ÇÑ´Ù. var myColor = {
red: 0, blue: 1, green: 2, }; //°´Ã¼ ÇÁ·ÎÆÛƼ ¸®½ºÆ®¸¦ for ±¸¹®À¸·Î °¡Á®¿Ã¶§´Â for ~ in ±¸¹®À» »ç¿ëÇØ¾ß ÇÑ´Ù. for( var key in myColor) { document.write('<p>' + key + ' : ' + myColor[key] + '</p>'); } //Object.keys ÇÔ¼ö´Â ¹è¿À» ¹ÝȯÇϹǷΠfor ~ of ±¸¹®À» »ç¿ëÇØ¾ß ÇÑ´Ù. for(var key of Object.keys(myColor)) { document.write('<p>' + key + ' : ' + myColor[key] + '</p>'); } »ç¿ë ¹æ¹ý±âº»ÀûÀÎ »ç¿ë¹æ¹ýÀº ´ÙÀ½°ú °°´Ù.var green = myColor.green;
var blue = myColor['blue']; ¼Ó¼º °¹¼ö ±¸Çϱâ var length = Object.keys(myColor).length;
°´Ã¼ ¼Ó¼º¾È¿¡ ¼Ó¼ºÀ» ¸¸µé¼öµµ ÀÖ´Ù. var blueColor = {
'list': {'index': 1, 'name': 'blue'} }; var name = blueColor['list']['name']; // blue var index = blueColor.list.index; // 1 ÇÔ¼ö¸¦ Æ÷ÇÔ ÇÒ¼öµµ ÀÖ´Ù. var blueColor = {
'list': {'index': 1, 'colorname': 'blue', show : function() { // 'index', 'colorname', 'show'¸¦ Ãâ·ÂÇÑ´Ù. console.log(Object.keys(this)); } } }; // blueColor['list']['show'](); blueColor.list.show(); ¼Ó¼º À¯¹« üũhasOwnProperty ÇÔ¼ö·Îµµ üũ ÇÒ¼ö ÀÖ´Ù. ÀÌ ¹æ¹ýÀÌ °¡Àå ¾ÈÀüÇÏ´Ù.if(blueColor.list.hasOwnProperty('colorname'))
console.log('hasOwnProperty: colorname'); 'undefined'·Î üũ ÇÒ¼ö ÀÖ´Ù. ¸¶Áö¸· ¼Ó¼ºÀÌ ¾ø¾îµµ »ó°ü¾øÁö¸¸ ºÎ¸ð ¼Ó¼ºÀÌ ¾øÀ¸¸é ÀÚ¹Ù ½ºÅ©¸³Æ® ¿À·ù°¡ ³´Ù. blueColor.list.bluename (¹®¹ý ¿À·ù ¾øÀ½) blueColor.arr.colorname (¹®¹ý ¿À·ù) if (typeof blueColor.list.colorname === 'undefined')
console.log('name property is missing'); undefined·Îµµ üũ ÇÒ¼ö ÀÖ´Ù. if (blueColor.list.colorname === undefined)
console.log('name property is missing'); !blueColor.list.colorname ¼Ó¼º ÀÚü¸¸À¸·Î üũ ÇÒ¼öµµ ÀÖ´Ù. ¼Ó¼ºÀÌ ÀÖÀ»¶§¸¸ ½ÇÇà ÇÒ¶§´Â ´ÙÀ½°ú °°ÀÌ ÇÑ´Ù. if(blueColor.list.colorname) console.log('OK !!!') if (!blueColor.list.colorname)
console.log('name property is missing'); Å×½ºÆ® ÆÄÀÏ : object_property.html |