JavaScript 实现类的多种方法实例

function coder()
{
    this.name = '现代魔法';
    this.job = 'Web 开发者';
    this.coding = function ()
    { alert('我正在写代码'); }
}

var coder = new coder();
alert(coder.name);
coder.coding();

function createCoderFactory()
{
    var obj = new Object();
    obj.name = '现代魔法';
    obj.job = '程序员';
    obj.coding = function ()
    {
        alert('我正在写代码');
    };
    return obj;
}
var coder = createCoderFactory();
alert(coder.name);
coder.coding();

function coder(){}
coder.prototype.name = '现代魔法';
coder.prototype.job = '程序员';
coder.prototype.coding = function(){
    alert('我正在写代码');
};
var coder = new coder();
alert(coder.name);
coder.coding();

var coder1 = new coder();
var coder2 = new coder();
alert(coder1.name);     /*显示现代魔法*/
coder2.name = 'nowamagic';
alert(coder1.name);     /*显示nowamagic*/
alert(coder2.name);     /*这个也显示nowamagic*/

function coder()
{
    this.name = '现代魔法';
    this.job = '程序员';
}
coder.prototype.coding = function(){
    alert('我正在写代码');
};

function coder()
{
    this.name = '现代魔法';
    this.job = '程序员';
    if (typeof(coder._init) == 'undefined')
    {
        this.coding = function ()
        {
            alert('我正在写代码');
        };
        this._init = true;
    }
}