About JS two-dimensional array and multidimensional array definition statement (detailed) _javascript skills

Declare one-dimensional array: var goodsarr = [];

assignment:goodsarr[0] = ' value ';

This is not controversial, because the usual use of PHP is more, and PHP syntax can be directly used goodsarr[0] = ' a '; This method declares an array and assigns it, but JS cannot use it, and must declare the existence of the array first. Similarly, if you are a two-dimensional array, you must declare a two-dimensional and multidimensional array before use, for example, a two-dimensional array:

var goodsarr[0] = [];

You must first declare a two-dimensional array to use a two-dimensional array, or you will get an error.

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