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Case toString () converts to string var num = 1; alert (num.toString ()); String () converts to string var num = 1; alert (String (num)); the result of plus sign concatenation and string concatenation is string var num = 1; alert (num + "I am a string"); / / 1. Convert numeric type to string type var num = 10; var str = num.toString () var str1 = num+'' console.log (str); console.log (typeof str); / / typeof js to view the data type console.log (String (num)); console.log (typeof String (num)); / / string console.log (str1); console.log (typeof str1)

String type conversion to numeric description case parselnt (string) function converts string type to integer numeric parselnt ('15') parseFloat (string) function converts string type to floating point numeric parseFloat (' 3.14') Number () forced conversion function converts string type to numeric Number ('12') js implicit conversion (- * /) implicit conversion to numeric' 12'-0big / 2 using arithmetic operations. Convert a string to a numeric type / / parseInt () console.log (parseInt ('15')); / / 15 console.log (typeof parseInt (' 15')); / / number console.log (parseInt ('3.14')); / / 3 console.log (parseInt (' 3.94')); / / 3 console.log (parseInt (3.94)); / 3 take the integer portion of a floating point number

/ / parseFloat console.log (parseFloat ('3.14')); / / 3.14 console.log (parseFloat (' 3')); / / 3Accord / number console.log (Number ('12')); / / 12 console.log (typeof Number (' 12')); / / number

/ / using arithmetic-* / implicit conversion console.log ('12'-0); / / 12 console.log (' 123-'120'); / / 3 console.log (' 123 calendar 1); / 123 console.log ('123 impulse 1); / / 123

Conversion to Boolean shows that the case Boolean () function converts other types to Boolean Boolean ('aniu')

Values that represent null and negative are converted to false, such as'', 0, NaN, null, undefined.

The rest of the values are converted to true.

Console.log (Boolean (')); / false console.log (Boolean ('')); / / true console.log (Boolean (0)); / / false console.log (Boolean (NaN)); / / false console.log (Boolean (null)); / / false console.log (Boolean (undefined)); / / false console.log (Boolean ('aniu')); / / true console.log (Boolean (15)); / / true

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