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js第一课:变量和函数的学习一.笔记 js代码主要的成员有两个:一是变量;二是函数js中表达式后面的分号可选; 1.变量的命名规则 不能以数字开头;可以是下划线、字母、$、数字组成;使用时一般用小驼峰法,即首字母小写,后面单词的首字母大写; 2....