angular $watch Changes of a variable (example explanation)

Without further ado, just upload the code

$scope.$watch('custArea', function(newValue, oldValue) {
   (newValue, function(item, key) {
    if($("000000") &gt; -1){
     // $("All provinces and cities in mainland China have been selected, other values are not selected");     $ =["000000"];
    }else{}
   });
  }, true);

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