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。

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