For careless people, wages are full of problems and traps. In private enterprises, wages are generally negotiated. As for whether the salary can be negotiated, the only way to know is to negotiate with the boss at once-but job seekers must remember the principle of "being calm". Because if you put the required salary on your resume, you take several risks.
The boss will know that your salary is higher than they are willing to pay. Even though you may take the initiative to reduce your salary, you won't have the opportunity to express your intention in person, because bosses are usually reluctant to hire people with less and less income, and they will think that you are using them to "fill the vacancy". Or they may think that giving you an interview is just a waste of your time.
Second, the boss will know that your current salary is far below what they are willing to pay. You may have an interview, but your salary chip has been greatly weakened. If the salary is negotiable, they will take your current salary as the starting salary. On the other hand, they may not give you an interview at all, because they will think you are too "insignificant" to be qualified for the job.
Third, you may provide very misleading information. Your current salary does not accurately reflect the value of this job to you. You may also have many other benefits, such as medical insurance, pension, free lunch and so on. All these benefits should be added to your total salary. Your salary may be higher than that of another boss at present, but the "total salary" offered by another company may be higher. On the contrary, your salary may be much lower now.
When the boss advertises, he usually won't say what the total salary is, but he will ask you to say your total salary. How you discuss the treatment with your current boss is a private matter between you. If you say what your salary is, write it down in the application letter-never mention it in your resume.