[JS] [25] The character string is converted to digital

text:

（1）parseInt()

parseInt ( "10", 2); // returns 2, represented by a binary string parsing the foregoing, generally not used

parseInt("1234blue"); //returns 1234
parseInt("123"); //returns 123
parseInt("22.5"); //returns 22
parseInt("blue"); //returns NaN

（2）parseFloat()

In decimal floating point, no base pattern

parseFloat("1234blue"); //returns 1234.0
parseFloat("22.5"); //returns 22.5
parseFloat("22.34.5"); //returns 22.34
parseFloat("0908"); //returns 908
parseFloat("blue"); //returns NaN

（3）Number()

Strong type conversion, overall conversion, not only the value conversion section

Number(false) 0
Number(true) 1
Number(undefined) NaN
Number(null) 0
Number( "5.5 ") 5.5
Number( "56 ") 56
Number( "5.6.7 ") NaN
Number(new Object()) NaN
Number(100) 100

Reference blog:

jquery to convert the string to a number - u010865136 column - CSDN blog
https://blog.csdn.net/u010865136/article/details/49336255