I'd like to be able to say something like this in javascript :(我想能够在javascript中说出这样的话：)
"a".distance("b")
How can I add my own distance function to the string class?(如何将自己的距离函数添加到字符串类？)
ask by will translate from so
You can extend the String prototype;(您可以扩展String原型；)
String.prototype.distance = function (char) {
var index = this.indexOf(char);
if (index === -1) {
alert(char + " does not appear in " + this);
} else {
alert(char + " is " + (this.length - index) + " characters from the end of the string!");
}
};
... and use it like this;(...并像这样使用它；)
"Hello".distance("H");
See a JSFiddle here .(在这里查看JSFiddle 。) 