要求：
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。
结果：
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 thenothing", "mountain")应该返回 false.
1 function confirmEnding(str, target) {
2 // "Never give up and good luck will find you."
3 var length=target.length;
4 var strlength=str.length;
5 var newstr=str.substr(strlength-length,length);
6 if(newstr==target){
7 return true;
8 }
9 else{
10 return false;
11 }
12 // -- Falcor
13 //return str;
14 }
15
16 confirmEnding("Bastian", "n");