微信官方javascript容错处理,防止服务端返回异常

作者：管理员

发布时间：2015/9/24 17:19:37

评论数：0

转载请自觉注明原文：http://www.jq-school.com/Show.aspx?id=716

微信官方javascript容错处理,防止服务端返回异常

window.global_serverTimeDiff = 0;
function global_getServerTime(){ return new Date().getTime() + global_serverTimeDiff; }
(function(){
    try{
        var server_local_date = 'Thursday, 24-Sep-2015 17:15:58 CST'; 
        var diff = new Date(server_local_date).getTime() - 14*3600*1000 - new Date().getTime();                
        window.global_serverTimeDiff = isNaN(diff) ? 0 : diff;//容错处理,防止服务端返回异常
        var canDiff = 60*1000;//可允许diff范围
        //相差大于60秒，把data缓存全部删除
        if(Math.abs(global_serverTimeDiff)>=canDiff){
            localStorage.removeItem("data_pub");
            localStorage.removeItem("data_user");
        }
        else {
            var lastDiff = localStorage.getItem("serverTimeDiff");
            if(lastDiff!=null){
                lastDiff = isNaN(lastDiff)?0:lastDiff;
                //上次相差和本次相差大于60秒 也删除本地缓存，可以容错从后面的时间改到正确的时间来
                if(Math.abs(lastDiff-diff)>=canDiff){
                    localStorage.removeItem("data_pub");
                    localStorage.removeItem("data_user");
                }
            }
        }
        localStorage.setItem("serverTimeDiff",global_serverTimeDiff);
    }catch(e){}
})();

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