如果else语句错误，Javascript

Question

我是javascript初学者，并尝试执行一些if else语句。基本上你可以在第二行看到我自己的代码！直到第七行。但是，dreamwaever标志着它永远是红色的！那我错了什么

    this.toDataURL = function() {
    if this.path == []
    {
     document.getElementById("canvascontent").value = "Oh yeah";
    }
    else
    {
    var canvas = document.createElement("canvas");
    var ctx = canvas.getContext("2d");
    canvas.width = innerWidth;
    canvas.height = innerHeight;
    ctx.drawImage(layer0, 0, 0);
    ctx.drawImage(layer1, 0, 0);
    ctx.drawImage(layer2, 0, 0);
    var url = canvas.toDataURL('image/png');
    document.getElementById("canvascontent").value = url;
    }       
};

Answer 1

您在()声明周围忘了if：

if (this.path == []) {

Answer 2

您忘了用括号括起if语句：

if (this.path == []) {

Answer 3

if (this.path == []) //You missed to enclose if statement.

通常

if ( statement ) {
}
else {
}

Answer 4

你忘了（）括号

if (this.path == []) {