测试震灾 _Web前端

测试地震

<script>
var times = 0;
var ms = new Date();
var prex =0;
var pretoright=false;
var level =0;
function trackEarthQuake(){
     var curx = event.screenX;
     var toright ;
     if(curx>prex){
         level += curx-prex;
         toright=true;
    } else {
        toright=false;
    }
    prex = curx;
    if(pretoright!=toright){
        times ++;
    }
    pretoright=toright;
    var   curms=new Date();
    if(times>=10){
        times=0;
        intervalms = curms-ms;
        if(intervalms<=1600){
        alert("有地震！快跑！地震级别为"+Math.round(Math.log(level)));
    }
    ms=curms;
    level=0;
}
}
</script>
<body onmousemove="trackEarthQuake()">
</body>