Bug fix: omitempty关键字，给它赋的值恰好等于默认空值的话，在转为 json 之后也不会输出这个 field
#539
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CheckPath这个字段默认是false，就算赋值了，只有true才能被json解析，这个是“omitempty” 关键字的LineColor这个字段也是，如果直接给Color结构体，就算注明omitempty关键字也无用，需要指针，这样 Golang 就能知道一个指针的“空值”是多少了，否则面对一个我们自定义的结构， Golang 是猜不出我们想要的空值的详情
https://www.jianshu.com/p/a2ed0d23d1b0