当我尝试追加时，FormData 不起作用

Question

In Google Chorome's DevTool I try to do that:

var fd = new FormData();
fd.append('newField', 'someValue');

but fd still is empty. Any Idea?

Answer 1

fd.get('newField');

The above will return 'someValue' .

You should note that it is supported on Chrome v50 and firefox v39. See here for support.