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用foreach遍历数组,在console中显示;利用splice增加和删除数组中的元素
学习并运用while循环,了解对象字面量,利用function求和
安装好环境和工具,上机验证了解JS的变量和分支结构
用所学的双飞翼布局显示一个简易的企业站点
利用清除浮动实现双飞翼布局
认识常用的选择器,了解它们的功能和优先级关系