Boolean(something) 会把里面的变量转化为布尔型
|
DATA TYPE |
VALUES CONVERTED TO TRUE |
VALUES CONVERTED TO FALSE |
|
Boolean |
true |
false |
|
String |
Any nonempty string |
“” (empty string) |
|
Number |
Any nonzero number (including infinity) |
0, NaN (See the “NaN” section later in this chapter.) |
|
Object |
Any object |
null |
|
Undefined |
n/a |
undefined |
原文：http://www.cnblogs.com/chuangweili/p/5163777.html