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To provide a string value to a function in Javascript, you can declare a variable with a string value and pass it as an argument to the function.

For example, if you have a function called greet that takes a string parameter name and returns a greeting message, you can provide a string value to it as follows:

function greet(name) {
  return "Hello, " + name + "!";
}

let myName = "Alice";
let greeting = greet(myName);

console.log(greeting); // Output: "Hello, Alice!"

In this example, the greet function takes a string parameter name and concatenates it with the greeting message "Hello, ". The myName variable is set to the string value "Alice", which is then passed as an argument to the function using greet(myName). The function returns the greeting message "Hello, Alice!", which is stored in the greeting variable. Finally, the message is printed to the console using console.log(greeting).