Usage examples of $.map() in jquery (code)

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$.map(data,function(item,index){return XXX})

Traverse each element in the data array and form a Put the new elements into the returned array

var b = $.map( [55,1,2], function( item,index ) {  return {  "label": item,  "value": index  }});
                        
                        alert(b[0].label +"  "+ b[0].value);

The output is: 55 0

[55,1,2] is an array ,According to the return condition, when the item in the function is 55, the index, which is the subscript of the array, is 0

$.map() The brackets in the brackets are equivalent to a loop

Loop multiple pieces of data and define the data as b

var array = [0, 1, 52, 97];
array = $.map(array, function(a, index) {  
return [a - 45, index];
});

The output is: [-45, 0, -44, 1, 7, 2, 52, 3]

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