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The basic data types commonly used in js are: value type (basically type): string array, data, Boolean value, null (empty), undefined, and tag. Reference basic data type: target, two-dimensional array parsing function. Give many examples of basic data types: String array let a=word; Data (Number) let b=123; Boolean let c=true; Null let d=null; Undefined (Und
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Stop grieving. A man who pretends to evaporate in the world is not worth remembering. You should treat him as dead. What you indulge in is not love, but habit, and it is a foolish single mode of thinking. Your life is not a one shot deal, love, go or will come.

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On the way forward, we are not afraid of being blocked by thousands of people, but we are afraid of surrender; The sail of life is not afraid of strong winds and waves, but afraid that you have no courage! If there is a way, go boldly; If you dream, fly boldly. Boldness should be our belief and dream, which will always be an empty dream. we should know that the direction against the wind is more suitable for flying, which is the direction of life struggle.