jQuery equivellent for dynamically create id

I am looking for jQuery equivellent for the following. Please help.

var request = document.getElementById('request_' + id1)
var response = document.getElementById('response_' +开发者_JS百科 id1); 
modifyText(request.firstChild.nodeValue,response.firstChild.nodeValue);

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Try

var request = $('#request_' + id1)
var response = $('#response_' + id1); 
modifyText(request.find(':first-child').text(),response.find(':first-child').text());

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var request = $('#request_' + id1);
var response = $('#response_' + id1);