JavaScript 数组元素交换：字符串拆解和重新组合

var hexArr = ['12', '34', '56']; for(var i = 0;i < hexArr.length;i++) { var temp = hexArr[i][0]; console.log(temp); console.log('hexArr[i][1]' + hexArr[i][1]); hexArr[i][0] = hexArr[i][1]; console.log('hexArr[i][0]' + hexArr[i][0]); hexArr[i][1] = temp; console.log('hexArr[i][1]' + hexArr[i][1]); }

运行结果是: 1 'hexArr[i][1]'2 'hexArr[i][0]'undefined 'hexArr[i][1]'2 3 'hexArr[i][1]'4 'hexArr[i][0]'undefined 'hexArr[i][1]'4 5 'hexArr[i][1]'6 'hexArr[i][0]'undefined 'hexArr[i][1]'6