海南自贸港跨境电商怎么做,济南seo,北京谷歌优化,新建网站注意事项数组遍历
1. for ( item in arr){…}
2. for ( i in arr.indeces ) {…} (遍历下标)
3. for ((index, item) in arr.withInfex()) {…} (遍历下标和元素)
4. arr.forEach {} ( 遍历元素 )
5. arr.forEachIndexed{index, item -> …}
数组遍历
1. for ( item in arr){…}
2. for ( i in arr.indeces ) {…} (遍历下标)
3. for ((index, item) in arr.withInfex()) {…} (遍历下标和元素)