javascript引擎长时间独占线程造成卡顿的解决方案_javascript技巧

function Ansync (totalCount, segmentCount, workCallback, returnCallback)
{
var num_of_item_for_each_segment = segmentCount;
var num_of_segment = Math.ceil(totalCount / num_of_item_for_each_segment);
var count_of_segment = 0;
var timer;
var start, end;
this.process = function(scope, timeout)
{
if (scope != undefined)
{
workCallback = workCallback.bind(scope);
returnCallback = returnCallback ? returnCallback.bind(scope) : undefined;
}
if (count_of_segment == num_of_segment)
{
clearTimeout(timer);
if (returnCallback != undefined)
returnCallback();
}
else
{
start = count_of_segment * num_of_item_for_each_segment;
end = Math.min(totalCount, (count_of_segment + 1) * num_of_item_for_each_segment);
if (num_of_segment == 1)//needn't create timer
{
workCallback(start, end);
count_of_segment = 1;
this.process();
}
else
{
timer = setTimeout(function ansyncTimeout(){
if (workCallback(start, end)) //finish process if function returns true
{
count_of_segment = num_of_segment;
}
else
{
count_of_segment++;
}
this.scope.process();
}.bind({scope: this}),timeout == undefined ? Ansync.TimeOut : timeout);
}
}
}
}
Ansync.TimeOut = 5;