How to find the longest word in a string

function findLongestWord(str) {
    //首先将字符串转换成数组，以空格为分割点
   var  arr = str.split(" ");
   //根据单词的长度  由长到短排列
   var t=0;
   for(var i=0;i<arr.length;i++){
       for(var j=0;j<arr.length;j++ )
       {
           if (arr[i].length > arr[j].length) {  
                    t = arr[i];  
                    arr[i] = arr[j];  
                    arr[j] = t;  
                }  
       }
   }
   //返回最长的单词长度
return arr[0].length;
}
//调用函数
findLongestWord("i am your girlfriend");

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