javascript - Ajax load percentage on page load -

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i have many ajax call on page loads. have nested ajax calls. this

function getall(){     $.when(http_get('url1')).then(function(response){         $.when(http_get('url2')).then(function(response){             $.when(http_get('url3')).then(function(response){

now how can overall ajax loading percentage show in preloader.


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