函数是初中数学的重要内容之一，它不仅是一个重要的数学概念，也体现了一种重要的数学思想方法。初中学生从学习数、式、方程等研究常量的计算问题，到学习函数，研究变量的变化规律，是认识上的一次重大飞跃。学习函数，可以帮助学生深化对代数式的认识，沟通方程、不等式、 Function is one of the important contents of junior high school mathematics. It is not only an important mathematical concept but also an important mathematical thinking method. It is a major leap in understanding that junior high school students study the computational problems of numbers, equations, equations, etc., study functions, and study the changing laws of variables. Learning functions can help students deepen their understanding of algebraic formulas, communicate equations, inequalities,