BlockSvg.getSvgRoot() 方法
返回 SVG 的根节点；如果根节点不存在，则返回 null。
Signature:
getSvgRoot(): SVGGElement;
返回：
SVGGElement
根 SVG 节点（可能是一个组）。
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最后更新时间 (UTC)：2025-07-25。
[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["没有我需要的信息","missingTheInformationINeed","thumb-down"],["太复杂/步骤太多","tooComplicatedTooManySteps","thumb-down"],["内容需要更新","outOfDate","thumb-down"],["翻译问题","translationIssue","thumb-down"],["示例/代码问题","samplesCodeIssue","thumb-down"],["其他","otherDown","thumb-down"]],["最后更新时间 (UTC)：2025-07-25。"],[],["The `getSvgRoot()` method, part of the `BlockSvg` class, retrieves the root node of the SVG element. It returns an `SVGGElement`, which is the root SVG node, likely a group. If no root node exists, it returns null. This method's core function is to provide access to the SVG's top-level element within the Blockly block structure.\n"]]