To Boolean: Boolean(value)
Undefined--------------false
Null----------------------false
Number:0,-0,NaN----false
空string-----------------false
Number:非 0,NaN--true
String:非空-------true
To number: Number(value)
Undefined-------------NaN
Null----------------------0
Boolean false---------0
Boolean true----------1
string""----------0
String(除了纯123这类)---NaN
To string: value.toString()或String(value)
Undefined,null-------第一种体式格局转换报错,第二种一般
用第一种体式格局转换前最好初始化一个变量,v.toString()
Value.toString(radix)上风在于可返回指定进制情势的字符串,以下
var a=123;a.toString(2)
"1111011"
True,false-------------"true""false"
NaN--------------------"NaN"
0,-0--------------------"0"
Number.POSITIVE_INFINITY------------"Infinity"
Number.NEGATIVE_INFINITY----------"-Infinity"
To Object:
Boolean--------------Boolean {[[PrimiriveValue]]:..}
String-----------------String {0:..,1:..,2:…,length:3,[[PrimiriveValue]]:..}
Number--------------Number {[[PrimiriveValue]]:..}
Undefined,null------{}空Object
Number进制之间的转换:
二进制、八进制、十六进制…转为十进制:parseInt(value,radix) parseInt('111',2)
十进制转为其他进制:value.toString(radix)
parseInt('ff',16).toString(2)
"11111111"