我在脚本中有一个自定义类/对象。在其中一种对象方法中,当我运行以下命令时:
MapLabel.prototype.show = function()
{
console.log(this); // Here are the
console.log(this.canvas); // lines in question
if (!this.canvas) // this is not giving the expected result
{
console.log('canvas doesnt exist to show');
return;
}
console.log('showing maplabel');
this.visible = true;
this.canvas.style['visibility'] = 'visible';
this.marker.setVisible(true);
}
我得到以下信息:
MapLabel {gm_accessors_: Object, fontFamily: "'Droid Sans', 'Helvetica Neue',
Helvetica, Arial, sans-serif", gm_bindings_: Object, fontSize: 14, fontColor: "#FFFFFF"…}
__e3_: Object
align: "center"
canvas: <canvas>
fontColor: "#FFFFFF"
fontFamily: "'Droid Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif"
fontSize: 14
gm_accessors_: Object
gm_bindings_: Object
gm_props_: Hu
id: 216
map: xh
marker: Ah
markerImage: Qh.MarkerImage
minZoom: 5
position: Q
strokeColor: "#000000"
strokeWeight: 4
text: "Sometext"
visible: false
zIndex: 100
__proto__: Dh
undefined // <---- this.canvas = undefined even though it exists?
您可以在输出中看到this.canvas
存在并具有值。但是当console.log(this.canvas)
紧随其后运行时,它会返回undefined
.
我在这里缺少什么吗?
更新:我添加了调用代码的函数