确认末尾字符算法挑战
问题:
检查一个字符串(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。
这个挑战可以通过在ES2015中引入的.endsWith()方法来解决。但是出于这个挑战的目的，我们希望您使用JavaScript子串方法之一。
要求：
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.
问题答案：
function confirmEnding(str, target) {
// "Never give up and good luck will find you."
// -- Falcor
var arr = str.replace(/\s+/g, "");
var bb = arr.substr(arr.length - target.length, arr.length);
if (bb == target) return true;
return false;
}
confirmEnding("Bastian", "n");