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 The role of call, apply, and bind is to change the context of function execution, and when they are used, they will change the this pointing to when the function is running. call, apply, and bind are all methods under Function.prototype, which are used to change the runtime context of the function. The final return value is the return value of the method you called. If the method has no return value, it returns undefined.

 This article mainly introduces the method of dynamically binding CSS styles in the Vue framework. By sharing simple examples, we gradually understand the value transfer and binding data in Vue. The introduction is very detailed and has certain reference value. Friends who need it can refer to it. First of all, let's talk about dynamic binding. Relatively, everyone knows static binding. For static binding, you can directly add class="". Dynamic binding must be based on a certain operation of the user to dynamically modify the style, which is more flexible. convenient.