对于字符串不管是加还是减,都是将字符串相连的过程.但是对空格的处理是不一样的,如果是+,则毫无疑问是两个字符串不加修改的合并,但是是减号,例如这道题中的?a-b,则需要将a="hello "的o后面的空格移到ab的末尾所以?a-b=helloeveryone (e后面有一个空格)
a+b=hello everyone,a+b=hello everyone这个逻辑表示式是正确的,即返回.T.
len(a-b)是取长度,数一下可得14（要将空格算上）
VF中字符表达式的问题.a='hello ' b='everyone' a+b=hello everyone求 a-b=
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