JavaScript小技巧

检查对象是不是数组Miller检测法

function isArray(obj){   return Object.prototype.toString().apply(obj)==='[object Array]';}

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同步延迟

function pausecomp(millis) {  var date = new Date();  var curDate = null;  do { curDate = new Date(); }  while(curDate-date < millis);}