d3表单提交，似乎跳过preventDefault所以它重新加载页面时它不应该

I am trying to make a form in d3 that doesn't reload the page when "submit" is clicked, but the contents of the function that tells it to do so seem completely skipped every time I submit, so the page reloads(i.e. it doesn't stop if I put a breakpoint inside the function). This happens in Firefox, Chrome and Safari.I am trying to make a form in d3 that doesn't r