There are ways to find the string in javascript

Is to use

indexOf ()

To find the string

Such as

 

var str="Hello Zoearth!"

alert(str.indexOf("Zoe")); //is  6
alert(str.indexOf("Hello")); //is  0
alert(str.indexOf("Moon")); //is  -1

It should be noted that when the position is zero when found
Direct judgment will become FALSE
So to determine whether the find string
Best to use

var str="Hello Zoearth!"
if (str.indexOf("Hello") > -1)
{
   alert(1);
}
else
{
   alert(2);
}

Such judges will be accurate
Thanksgiving!