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1. 变量,常量,数据类型,实例演示,注意命名规范;js的变量和常量,变量可更新,可先声明再赋值,常量不可更新,声明时必须初始化,变量声明用let,常量声明用const &...
php学习第二天0629回顾一下今天的学习1.元素2.标签3.属性标签是元素的功能,属性是元素的特征下面做一个表