WeChat Program Basic Class Library

console

Console.log method is used to output information in the console window. It can accept multiple parameters and connect their results to the 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

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

Json

Method

• stringify(object): Converts the object object to a JSON string and returns the string.
• parse(string): Transforms the JSON string into an object and returns it.

Example 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 methods.