Javascript Prototype String - accessing string value

问题

Im trying to Add a few methods to the Javascript String Object. one of the main methods im trying to add is a substring count function

String.prototype.substring_count = function(delimiter){
    return {THIS IS WHAT I NEED THE STRING FOR}.split(delimiter).length;
}

Where do you access the string in the String object?

回答1:

Use this. In the documentation, it is mentioned

If the method is on an object's prototype chain, this refers to the object the method was called on

in this case, the string itself

String.prototype.substring_count = function(delimiter){
    return this.split(delimiter).length;
}

console.log('test,123'.substring_count(','));

来源：https://stackoverflow.com/questions/33477092/javascript-prototype-string-accessing-string-value