The _javascript techniques of associative array and common array in JS

var privarr = [];
  privarr[' staprojquerygrid '] = [{
    btn_id: ' But_add ',
    roles: [' 2001 ', ' the ' of the '] ']
  
  console.log (Privarr, PRIVARR.STAPROJQUERYGRID[0].BTN_ID)

The first line is to define an array Priarr, and the second line is to add a property staprojquerygird to the array, which is an array. Print result is But_add

var Unprivarr = [];//creates an empty array and assigns it to Unprivarr

unprivarr[' 1000 ']=[];//inserts an empty array into the empty array unprivarr, equivalent to unprivarr[1000]=[]

unprivarr[' 1000 ' [' AAA ']={' but_check1 ': 1, ' But_check2 ': 1};

Add a property named AAA to the empty array above (because JS is all objects, so the array is also an object, you can add properties and methods), the property value is a new object (that is, {' But_check1 ': 1, ' But_check2 ': 1}).

There is a big difference between this and the above. First the second line if [] inside is a number, then the array unpriarr the 1001th element is also an empty array (temporarily called X), the first 1000 elements are undifined,

If it's a variable, it's an array unpriarr element.

The third line is to add a property to x AAA, the attribute value is an associative array {' But_check1 ': 1, ' But_check2 ': 1}

You can use x[' but_check1 ' to get the corresponding value

And I want to do associative arrays add attributes to an object?

var Unprivarr = [];//creates an empty array and assigns it to Unprivarr

unprivarr[' 1000 ']=[];//inserts an empty array into the empty array unprivarr, equivalent to unprivarr[1000]=[]

unprivarr[' 1000 ' [' AAA ']={' but_check1 ': 1, ' But_check2 ': 1};

Console.log (unprivarr[1000].aaa[' But_check1 ')

This can output the result 1 correctly, or it can output the result with unprivarr[1000].aaa.but_check1, but if quoting is wrong

If the third line to {} inside the quotation mark removed, fourth will be an error, at this time can only use Unprivarr[1000].aaa.but_check1

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