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node_modules/indexof/index.js 199 Bytes
aaac7fed   liuqimichale   add
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  var indexOf = [].indexOf;
  
  module.exports = function(arr, obj){
    if (indexOf) return arr.indexOf(obj);
    for (var i = 0; i < arr.length; ++i) {
      if (arr[i] === obj) return i;
    }
    return -1;
  };