concat():
var arr1=[1,2,3,4];
var arr2=['marie','tony'];
var arr3=['safe','sound'];
alert(arr1.concat(arr2,arr3))
reverse():
var arr1=[1,2,3,4,55,4,33,22];
alert(arr1.reverse())
字符串取反：先通过split('')转成数组，再数组取反，再转成字符串
var str='fabcilglh';
alert(str.split('').reverse().join(''))
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