JavaScript基础算法——检查字符串结尾

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要求：

判断一个字符串(str)是否以指定的字符串(target)结尾。

如果是，返回true;如果不是，返回false。

样本：

confirmEnding("Bastian", "n") 应该返回 true.

confirmEnding("Connor", "n") 应该返回 false.

confirmEnding("Walking on water and developing software from a specification are easy if both are frozen", "specification") 应该返回 false.

confirmEnding("He has to give me a new name", "name") 应该返回 true.

confirmEnding("He has to give me a new name", "me") 应该返回 true.

confirmEnding("He has to give me a new name", "na") 应该返回 false.

confirmEnding("If you want to save our world, you must hurry. We dont know how much longer we can withstand the nothing", "mountain") 应该返回 false.

解法：

function confirmEnding(str, target) {
  if(str.substr(-target.length, target.length)==target) return true;
  return false;
}

confirmEnding("Bastian", "n");