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This content briefly introduces key JavaScript concepts including the 'call', 'apply', and 'bind' methods, as well as callbacks. The 'call' method allows a function to be invoked with a specified 'this' value and arguments provided individually. The 'apply' method is similar but accepts arguments as an array. The 'bind' method creates a new function that, when called, has its 'this' keyword set to the provided value. Callbacks are functions that are passed as arguments to other functions and are executed later. These concepts are fundamental in JavaScript for understanding function invocation and context management.

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Risk warning: Digital asset trading is an emerging industry with bright prospects, but it also comes with huge risks as it is a new market. The risk is especially high in leveraged trading since leverage magnifies profits and amplifies risks at the same time. Please make sure you have a thorough understanding of the industry, the leveraged trading models, and the rules of trading before opening a position. Additionally, we strongly recommend that you identify your risk tolerance and only accept the risks you are willing to take. All trading involves risks, so you must be cautious when entering the market.

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