使用同步In Ajax请求

Question

For some business I need use synchronous for Ajax, could someone help me how to use, I find some code like this but not understand what it do.

function getData(productId, storeId) {
  var returnHtml = '';

  jQuery.ajax({
    url: "/includes/unit.jsp?" + params,
    async: false,
    cache: false,
    dataType: "html",
    success: function(html){
      returnHtml = html;
    }
  });

  return returnHtml;
}

Answer 1

Your code is the standard jQuery ajax code with async property set to false. This forces the ajax call to be synchronous.

function getData(productId, storeId) {
  var returnHtml = '';

  jQuery.ajax({
    url: "/includes/unit.jsp?" + params,
    async: false, // <-- this forces the ajax call to be synchronous.
    cache: false,
    dataType: "html",
    success: function(html){ //<<-- This is where you get the ajax response
      returnHtml = html;
    }
  });

  return returnHtml;
}

Just be aware that synchronous ajax calls are not very performant.