js方法实现页面停留几秒

js中不存在自带的sleep方法，要想休眠需要自己定义个方法

直接调用函数sleep(500),表示页面停留0.5s后在执行下面的代码

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function sleep(numberMillis) {     var now = new Date();     var exitTime = now.getTime() + numberMillis;     while (true) {         now = new Date();         if (now.getTime() > exitTime)         return;     } }

 

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sleep: function(numberMillis) {     var now = new Date();     var exitTime = now.getTime() + numberMillis;     while (true) {         now = new Date();         if (now.getTime() > exitTime)             return;     } },