javascript string contains character

var string = "foo",
    substring = "oo";

console.log(string.includes(substring));var str = "We got a poop cleanup on isle 4.";
if(str.indexOf("poop") !== -1){
	alert("Not again");
}
//use indexOf (it returns position of substring or -1 if not found)if (your_string.indexOf('hello') > -1)
{
  alert("hello found inside your_string");
}