一、六種數(shù)據(jù)類型#
原始類型(5種)
- string
- number
- boolean
- null
- undefined
object(對(duì)象類型)
- Function
- Array
- Date
...
二、隱式轉(zhuǎn)換#
var x = 'The answer is ' + 42;
var y = 42 + ' is the answer';
'37' - 7 // 30
'37' + 7 // '377'
巧用 +/- 規(guī)則轉(zhuǎn)換類型
num - 0
num + ''
對(duì)象的對(duì)比#
[1,2] == [1,2] // false
對(duì)象的對(duì)比是通過引用
包裝對(duì)象#
var str = 'string'; //基本對(duì)象
var strObj = new String('string');
