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``` var a = [1,2,5,7,3]; var b = [1,7,2]; function isContained(aa,bb){ if(!(aa instanceof Array)||!(bb instanceof Array)||((aa.length < bb.length))){ return false; } var aaStr = aa.toString(); for (var i = 0 ;i < bb.length;i++) { if(aaStr.indexOf(bb[i]) < 0) return false; } return true; } var c = isContained(a,b); console.log(c); ``` 输出结果为true