var x = arr[1].slice(1,2);
var len= arr.length alert('欢迎'+arr.slice(0,len-1)+'和'+arr[len-1]+'同学！');
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小老虎喜欢就好
var x = arr[1].slice(1,2);
var len= arr.length alert('欢迎'+arr.slice(0,len-1)+'和'+arr[len-1]+'同学！');