JavaScript 数据类型转换表

下表显示了将不同的javascript值转换为number，string和boolean的结果：

原始值	转换为number	转换为string	转换为boolean
false	0	"false"	false
true	1	"true"	true
0	0	"0"	false
1	1	"1"	true
"0"	0	"0"	true
"1"	1	"1"	true
nan	nan	"nan"	false
infinity	infinity	"infinity"	true
-infinity	-infinity	"-infinity"	true
""	0	""	false
"20"	20	"20"	true
"twenty"	nan	"twenty"	true
[ ]	0	""	true
[20]	20	"20"	true
[10,20]	nan	"10,20"	true
["twenty"]	nan	"twenty"	true
["ten","twenty"]	nan	"ten,twenty"	true
function(){}	nan	"function(){}"	true
{ }	nan	"[object object]"	true
null	0	"null"	false
undefined	nan	"undefined"	false

注意：引号（""）中的值表示字符串值。在红色的值是程序员可能不希望被转换为的值。

更多的javascript类型转换相关文章。