[英]Javascript attribute is NaN
我有以下javascript代码:
var Environment = function() {
this.road_frame_id = 1;
}
Environment.prototype.nextRoadFrame = function() {
if((this.road_frame_id -= 1) < 1) {
this.road_frame_id = 3;
}
document.getElementById("road").setAttribute("src", "images/road_background_" + this.road_frame_id + ".png");
}
var environment = new Environment();
setInterval(environment.nextRoadFrame, 150);
但是似乎在函数nextRoadFrame内应将属性this.road_frame_id作为值NaN设置为3时,为什么会这样?
谢谢
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