Javascript代码错误

[meceky]

   <script language = "javascript" type = "text/javascript">
          function ImmutableRectangle(w,h) {
              this.getWidth = function() { return w; }
              this.getHeight = function() { return h; }
          }
          ImmutableRectangle.prototype.area = function() {
              return this.getWidth() * this.getHeight();
          }
          ImmutableRectangle tt = new ImmutableRectangle(4,7)
          document.write(tt.area());
         // ImmutableRectangle hhh = new ImmutableRectangle(4,5);
      </script>

ImmutableRectangle tt = new ImmutableRectangle(4,7)此句有错误！怎么修改啊

[cpp2017]

var tt = new ImmutableRectangle(4,7);

js中没有显示变量类型的．

[meceky]

晕！写C#习惯了。。。看了半天也没有看出来怎么回事！！！

[FangYANYI]

function ImmutableRectangle(w,h) {
this.getWidth = function() { return w; }
this.getHeight = function() { return h; }
}
改成
IImmutableRectangle function(w,h)
{
this.getWidth = function() { return w; }
this.getHeight = function() { return h; }
};

[cpp2017]

这个错误我也经常犯，常见的就是

int i = .....;

经常找不出来．因为这个写法
太熟悉了

[浴火_凤凰]

var tt = new ImmutableRectangle(4,7);