Realization method of synchronization of different JS asynchronous functions _javascript Skills

function simulation of different functions to achieve synchronization

Funclist is the queue of function execution functions in which the flag=true is the number of synchronized tokens in the callback function

<script>
var flag = false;
function Functest (t,func) {
  settimeout (function () {
   (param) {
     console.log (param);
     Func ();
   } (t));
   },t*1000);
var funclist = [];
Funclist.push (function () {functest (4,function () {
  flag = true;//Synchronous Token
})});//Different asynchronous functions are added to the queue
Funclist.push (function () {functest (3,function () {
  flag = true;
})}; /different asynchronous functions are added to the queue
Funclist.push (function () {functest (2,function () {
  flag = true;
})}); /different asynchronous functions are added into the queue
Dealfuncsync (funclist);
function Dealfuncsync (funclist) {
  function Callbacksync () {
   if (!funclist| | funclist.length==0) {
     console.log (' End ');
     return;
   }
   Flag = false;
   Funclist.shift () ();
   settimeout (function () {
      if (flag) {//Control queue function Synchronization
       callbacksync ();
      } else{
       settimeout (arguments.callee,100);
      }
   },100);
  }
  Callbacksync ();
}
</script>

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