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Base Library

Last updated: 2024-07-12 16:53:47

    console

    The console.log method is used to output messages in the console window. This method can accept multiple parameters and concatenate their results for output.

    Math

    Properties

    E
    LN10
    LN2
    LOG2E
    LOG10E
    PI
    SQRT1_2
    SQRT2
    For information on using the above properties, refer to the ES5 standard.。

    Methods

    abs
    acos
    asin
    atan
    atan2
    ceil
    cos
    exp
    floor
    log
    max
    min
    pow
    random
    round
    sin
    sqrt
    tan
    For information on using the above properties, refer to the ES5 standard.

    JSON

    Methods

    stringify(object): Converts the object object into a JSON string and returns the string.
    parse(string): Converts the JSON string into an object and returns the object.
    Sample code:
    console.log(undefined === JSON.stringify());
    console.log(undefined === JSON.stringify(undefined));
    console.log("null"===JSON.stringify(null));
    
    console.log("111"===JSON.stringify(111));
    console.log('"111"'===JSON.stringify("111"));
    console.log("true"===JSON.stringify(true));
    console.log(undefined===JSON.stringify(function(){}));
    
    
    console.log(undefined===JSON.parse(JSON.stringify()));
    console.log(undefined===JSON.parse(JSON.stringify(undefined)));
    console.log(null===JSON.parse(JSON.stringify(null)));
    
    console.log(111===JSON.parse(JSON.stringify(111)));
    console.log("111"===JSON.parse(JSON.stringify("111")));
    console.log(true===JSON.parse(JSON.stringify(true)));
    
    console.log(undefined===JSON.parse(JSON.stringify(function(){})));
    

    Number

    Properties

    MAX_VALUE
    MIN_VALUE
    NEGATIVE_INFINITY
    POSITIVE_INFINITY
    For information on using the above properties, refer to the ES5 standard.

    Date

    Properties

    parse
    UTC
    now
    For information on using the above properties, refer to the ES5 standard.

    Global

    Properties

    NaN
    Infinity
    undefined
    For information on using the above properties, refer to the ES5 standard.

    Methods

    parseInt
    parseFloat
    isNaN
    isFinite
    decodeURI
    decodeURIComponent
    encodeURI
    encodeURIComponent
    For information on using the above properties, refer to the ES5 standard.

    

    
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