//判断某个数组中是否包含另一个数组
function isContained (a, b){
    if(!(a instanceof Array) || !(b instanceof Array)) return false;
    if(a.length < b.length) return false;
    var aStr = a.toString();
    for(var i = 0, len = b.length; i < len; i++){
        if(aStr.indexOf(b[i]) == -1) return false;
    }
    return true;
}

 

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