javascript - 在这里在 Javascript 中使用 "this"和 "prototype"有区别吗？

Question

下面两个代码有区别吗，我想没有。

function Agent(bIsSecret)
{
    if(bIsSecret)
        this.isSecret=true;

    this.isActive = true;
    this.isMale = false;
}

和

function Agent(bIsSecret)
{
    if(bIsSecret)
        this.isSecret=true;
}

Agent.prototype.isActive = true;    
Agent.prototype.isMale = true;

Answer 1

至少在将非原始对象分配给 this.somevar 或 prototype.somevar 时存在差异。

尝试运行这个:

function Agent(bIsSecret)
{
    if(bIsSecret)
        this.isSecret=true;

    this.isActive = true;
    this.isMale = false;
    this.myArray = new Array(1,2,3);
}

function Agent2(bIsSecret)
{
    if(bIsSecret)
        this.isSecret = true;
}

Agent2.prototype.isActive = true;    
Agent2.prototype.isMale = true;
Agent2.prototype.myArray = new Array(1,2,3);

var agent_a = new Agent();
var agent_b = new Agent();

var agent2_a = new Agent2();
var agent2_b = new Agent2();

if (agent_a.myArray == agent_b.myArray) 
    alert('agent_a.myArray == agent_b.myArray');
else
    alert('agent_a.myArray != agent_b.myArray');

if (agent2_a.myArray == agent2_b.myArray) 
    alert('agent2_a.myArray == agent2_b.myArray');
else
    alert('agent2_a.myArray != agent2_b.myArray');