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resizable workspace原理：定义一个空div，areaBlockly,并且让其占满你希望blackly占据的区域，然后监听窗口resize事件，将blackly的大小覆盖到areaBlockly之上。 ngx-blockly默认是position:absolute;height:100%;width:100%;可以通过获取其封装的组件，动态改变其样式.
shadow block:占位符块 xml直接转为代码 自定义block 自定义field block factory tab && block云存储 block library 语言 实时看到对应的代码 可视化新增toolbar和block（包括自定义的block） theme配置 https://scratch.mit.edu/ ---- 基于blockly做的
value input :连接到output connection of a value block; statement input: 连接到previous connection of a statement block Dummy input: don't have a block collection
Fields: field_input field_dropdown field_checkbox field_colour field_number field_angle field_variable field_date field_label field_image. Inputs: input_value input_statement input_dummy
alt字段，如果blockly无法识别该对象的type,则使用该alt对象代替其位置 inputsInline: false, // 控制输入是否是内联 helpUrl: 鼠标右键出现的弹窗，点帮助访问的URL
blockly提供了九种常用颜色变亮 '%{BKY_LOGIC_HUE}' '%{BKY_LOOPS_HUE}' '%{BKY_MATH_HUE}' '%{BKY_TEXTS_HUE}' '%{BKY_LISTS_HUE}' '%{BKY_COLOUR_HUE}' '%{BKY_VARIABLES_HUE}' '%{BKY_VARIABLES_DYNAMIC_HUE}' '%{BKY_PROCEDURES_HUE}'