javascript - D3.js - "svg:"中的 "svg:rect"是必须的吗？

Question

例如:

svg.append("svg:rect");

1. 如果我删除“svg:”怎么办？它似乎没有“svg:”也能工作。丢弃它有什么潜在的问题吗？
2. “svg:”是 d3 特有的东西还是在 svg 时通常需要使用元素？

Answer 1

来自 d3.js append() documentation

The name may be specified either as a constant string or as a function that returns the DOM element to append. When the name is specified as a string, it may have a namespace prefix of the form "namespace:tag". For example, "svg:text" will create a "text" element in the SVG namespace. By default, D3 supports svg, xhtml, xlink, xml and xmlns namespaces. Additional namespaces can be registered by adding to d3.ns.prefix. If no namespace is specified, then the namespace will be inherited from the enclosing element; or, if the name is one of the known prefixes, the corresponding namespace will be used (for example, "svg" implies "svg:svg").

因此命名空间(在大多数情况下)是可选的，因为 this提交。