var arr = ['小明', '小红', '大军', '阿黄', '旺财', '小强']; arr.sort(); var x = ''; var arr02; if (arr.length < 1) { alert('信息为空!'); } if (arr.length === 1){ x = arr[0]; alert('欢迎' + x + '同学!'); } else if (arr.length > 1){ arr02 = arr.slice(0, arr.length-1); x = arr02.join(',') + '和' + arr[arr.length-1] alert('欢迎' + x + '同学!'); }
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