有没有办法用ECMA脚本方式编写“String.prototype.distance=function（char）{}”呢？扩展本机JavaScript对象通常是一种不好的做法。看看有人这样做叫什么。如果你只是添加了一个新方法，那么这算是猴子补丁还是其他什

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有没有办法用ECMA脚本方式编写“String.prototype.distance=function（char）{}”呢？扩展本机JavaScript对象通常是一种不好的做法。看看有人这样做叫什么。如果你只是添加了一个新方法，那么这算是猴子补丁还是其他什么？@still_dreaming_1它被称为扩展：当有人这样做时，它被称为什么。如果你只是添加了一个新方法，那么这算是猴子修补还是其他什么？@still_dreaming_1它被称为扩展：这正是我要寻找的。虽然被接受的答案回答了最初的问题，但这是一个更强的总体答案。我必须问一下为什么return（str）和return str？我在为string类创建一个新方法，类似于

string.prototype.toJadeCase（）

。这个答案帮助我实现了这一目标。这正是我一直在寻找的。虽然被接受的答案回答了最初的问题，但这是一个更强的总体答案。我必须问一下为什么return（str）和return str？我在为string类创建一个新方法，类似于

string.prototype.toJadeCase（）

。这个答案帮助我做到了这一点。

   "a".distance("b")

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!");
    }
};

"Hello".distance("H");

String.prototype.distance = function( arg ) {
    // code
};

String.prototype.distance = function (){ 
    //your code 
}

var dom; //you can replce this to be $ just like jQuery
dom = function(elm) {
if(typeof elm === "object") {
   // already done example 
   //typeof document.getElementById('id') will be object
   return [elm];
 } else {
    return document.querySelectorAll(elm);
 }
} // Returns elements by all css selector eg
// .class #id id p id > p id ~ p in short any css selectors 
 Object.prototype.text = function(txt) {  //object prototype as NodeList returned would be object or maybe displayed as [Object NodeList]
     var i = 0; //loop through the elements 
     for(i; i < this.length; i++) {
        this[i].innerHTML = txt;
      }
 // in this function this refers to object that this function is passed on
 };
 dom('.classh').text('Changed for elements with classh');
 dom('#heading').text('Changed for elements with id heading'); //examples

String.prototype.
OPERATES_ON_COPY_OF_STRING = function ( 
    ARGUMENT 
){

    //:Get primitive copy of string:
    var str = this.valueOf();

    //:Append Characters To End:
    str = str + ARGUMENT;

    //:Return modified copy:
    return( str );
};

var a = "[Whatever]";
var b = a.OPERATES_ON_COPY_OF_STRING("[Hi]");
console.log( a ); //: [Whatever]
console.log( b ); //: [Whatever][Hi]

String.prototype.
EDIT_IN_PLACE_DOES_NOT_WORK = function ( 
    ARGUMENT 
){

    //:Get string object:
    var str = this;

    //:Append Characters To End:
    var LN = str.length;
    for( var i = 0; i < ARGUMENT.length; i++){
        str[LN+i] = ARGUMENT[ i ];
    };

};

var c = new String( "[Hello]" );
console.log( c );
c.EDIT_IN_PLACE_DOES_NOT_WORK("[World]");
console.log( c );