無法傳遞，導致海葵出不來，后來干脆

//定義一個海葵對象的類
var?aneObj?=?function()
{
};
//定義?？膶挕⒏邔傩?var?x?=?[];
var?y?=?[];
//定義?？麄€數
aneObj.prototype.num?=?50;
//初始化確定每一個?？奈恢?aneObj.prototype.init?=?function()
{
????for(var?i?=?0;?i?<?this.num;?i++)?{
????????//寬
????????x[i]?=?i?*?20?+?Math.random()?*?20;//Math.random()隨機[0,1]
????????//高
????????y[i]?=?200?+?Math.random()?*?50;
????}
????console.log(x[i]);

};
//繪制?？?aneObj.prototype.draw?=?function()
{
????//指定api區間樣式生效
????ctx2.save();
????ctx2.globalAlpha?=?0.6;
????ctx2.lineWidth?=?'20';
????ctx2.lineCap?=?'round';
????ctx2.strokeStyle?=?'#3b154e';
????for(var?i?=?0;?i?<?this.num;?i++)?{
????????//beginPath,moveTo,lineTo,strokeStyle,stroke,lineWidth,lineCap,globalAlpha
????????ctx2.beginPath();
????????ctx2.moveTo(x[i],canHeight);
????????ctx2.lineTo(x[i],canHeight?-?y[i]);
????????ctx2.stroke();
????}
????ctx2.restore();
};