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< 和<

你好。我很好奇，有人能告诉我< <自动化和脚本

Re: What is the difference between <<

有些情况也一样。但对于父母的最后一个孩子来说，

<< sib 将返回 empty() 并且 << next 将进入下一级：

// the same:
New window("v1", mainLB = HList box(x = V list box( tb1 = Text Box("v1"), tb2=Text Box("2") ), tb3=text box ("  3")));
wait(0);
(current report()[TextBox(1)]  << next()) << select;

New window("v2", mainLB = HList box(x = V list box( tb1 = Text Box("v2"), tb2=Text Box("2") ), tb3=text box ("  3")));
wait(0);
(current report()[TextBox(1)] << sib()) << select;

// << next walks to the next level and returns tb3
New window("v3", mainLB = HList box(x = V list box( tb1 = Text Box("v3"), tb2=Text Box("2") ), tb3=text box ("  3")));
wait(0);
(current report()[TextBox(2)]  << next()) << select;

// << sib returns Empty - and select will fail
New window("v4", mainLB = HList box(x = V list box( tb1 = Text Box("v4"), tb2=Text Box("2") ), tb3=text box ("  3")));
wait(0);
(current report()[TextBox(2)] << sib()) << select;

回复：< <

谢谢@hogi 。很有道理。