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loop is used to display the last index number that this section looped. This can be used inside or after the section.
loop 用于顯示該循環(huán)上一次循環(huán)時(shí)的索引值. 該值可以用于循環(huán)內(nèi)部或循環(huán)結(jié)束后.
Example 7-28. section property index
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