function ComplexCustomOverlay(point, text, mouseoverText){ this._point = point;this._text = text; this._overText = mouseoverText; }一般構造函數是this.point = point;，為什么要寫成this._point = point呢？
請問this._point = point;是什么意思，謝謝！
慕森王
2018-09-11 10:15:45
