console

The 'console.log' method is used to output information in the console window. It can accept multiple parameters, concatenating their results for output.

Math

property

• E
• LN10
• LN2
• LOG2E
• LOG10E
• PI
• SQRT1_2
• SQRT2

Please refer to the 'ES5' standard for the specific use of the above properties.

method

• abs
• acos
• asin
• atan
• atan2
• ceil
• cos
• exp
• floor
• log
• max
• min
• pow
• random
• round
• sin
• sqrt
• tan

JSON

method

• 'stringify(object)': Converts the 'object' object to a 'JSON' string and returns the string.
• 'parse(string)': Converts a '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

property

• MAX_VALUE
• MIN_VALUE
• NEGATIVE_INFINITY
• POSITIVE_INFINITY

Please refer to the 'ES5' standard for the specific use of the above properties.

Date

property

• parse
• UTC
• now

Please refer to the 'ES5' standard for the specific use of the above properties.

Global

property

• NaN
• Infinity
• undefined

Please refer to the 'ES5' standard for the specific use of the above properties.

method

• parseInt
• parseFloat
• isNaN
• isFinite
• decodeURI
• decodeURIComponent
• encodeURI
• encodeURIComponent

Please refer to the 'ES5' standard for the specific use of the above properties.