Display type conversion in JS

This time I will bring you the display type conversion in JS , what are the precautions for display type conversion in JS, the following is a practical case, let's take a look.

Number(), convert things into numeric types

Number('123');          //123Number('-123');         //-123Number('a');            //NaNNumber(true);           //1Number(null);           //0Number(undefined);      //NaNNumber(NaN);            //NaN

parseInt(string, radix), convert strings into integers in the corresponding base system

parseInt('10', 16);     //16parseInt('b', 16);      //11parseInt('b');          //NaNparseInt('3', 2);       //NaN,因为3不是二进制的parseInt(true);         //NaNparseInt('123abc');     //123parseInt('abc123');     //NaN

parseFloat(string, radix), convert the string into a floating point number in the corresponding base system

String(mix)

Convert things into string type, undefined and null can be converted into string form

String(null);           //"null"String(undefined);      //"undefined"
toString(radix)

Convert things into string types, undefined and null cannot be used, radix is ​​based on decimal and converted into the target base

var num = 100;
num.toString();     // "100"//注意，不能直接123.toString()，会报错

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