JS的递增/递减运算符和带操作的赋值运算符的等价式
1.递增/递减运算符等价式
a=b++;
<=> a=b;b=b+1;
a=++b;
<=> b=b+1;b=b;
a=b--;
<=> a=b;b=b-1;
a=--b;
<=> b=b-1;b=b;
所以，a=5;b=6;var3=a++*--b，结果为25
2.带操作的赋值运算符等价式a*=b;
<=> a=a*b;
a/=b;
<=> a=a/b;
a+=b;
<=> a=a+b;
a-=b;
<=> a=a-b;
a%=b;
<=> a=a%b;
a&=b;
<=> a=a&b; //从&=开始，下边都是逐位运算符
a|=b;
<=> a=a|b;
a^=b;
<=> a=a^b;
a>>=b;
<=> a=a>>b;
a<<=b;
<=> a=a<<b;
a>>>=b;
<=> a=a>>b; //C#没有此运算符
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