Javascript type conversion

JS type conversion

1. convert to a Boolean method: var boolvalue = !! X; or var boolvalue = Boolean (X );

To false, 0, "", null, undefied, Nan

2. Convert to character: var stringvalue = string (x), VAR stringvalue = x + '',

VaR stringvalue = x. tostring ()

3. Convert to numeric type:

Value Calculation var numvalue = stringvalue-0; (-or * or + or/), VAR numvalue = + stringvalue

VaR numvalue = Number (stringvalue), VAR numvalue = parsefloat (x, 16) (X is hexadecimal), VAR numvalue = parseint (x, 16)