js关卡函数，throat函数实现，定时运行函数

function throat(callback,num){var timer = null;callback = callback || function(){};return function(){if(!timer){var that = this;var arg = arguments;timer = setTimeout(function(){callback.apply(that,arg);timer = null;},num);}}}var throats = throat(function(e){console.log(e.screenX,e.screenY);},1000);window.onmousemove = function(e){throats(e);};