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javascript数据类型和分支结构实例演示分支的不同类型,注意else的本质 一.笔记 js中的数据类型主要有以下两种 原始数据类型:包含数值/字符串/布尔/undefined/null 引用数据类型:包含数组/对象/函数 二.数组的类型1....