javascript - 如何检查我的字符串是否包含 JavaScript 中的句点？

Question

我希望能够检测一个字符串是否有一个 .并根据它返回 true/false。

例如:

"myfile.doc" = TRUE

对比

"mydirectory" = FALSE;

Answer 1

使用indexOf()

var str="myfile.doc";
var str2="mydirectory";

if(str.indexOf('.') !== -1)
{
  // would be true. Period found in file name
  console.log("Found . in str")
}

if(str2.indexOf('.') !== -1)
{
  // would be false. No period found in directory name. This won't run.
  console.log("Found . in str2")
}