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自定义一个函数sleep
function sleep(numberMillis) {
var now = new Date();
var enterTime= now.getTime() + numberMillis;
while (true) {
now = new Date();
if (now.getTime() > enterTime
function sleep(numberMillis) {
var now = new Date();
var enterTime= now.getTime() + numberMillis;
while (true) {
now = new Date();
if (now.getTime() > enterTime