Question

例1

var Reptile = function () {
  var reptile = this;
   this.showBla = function() {
       alert(reptile.bla);
   }
}

var turtle = new Reptile();
turtle.bla =  whatever ;
turtle.showBla();

例2

var Reptile = function () {
   this.showBla = function() {
       alert(this.bla);
   }
}

var turtle = new Reptile();
turtle.bla =  whatever ;
turtle.showBla();

实例1 有时似乎把东西推倒在构造中直接界定“这”?

Answer 1

是的,如果你可能需要在某种职能范围内确定一项职能,以“这种”方式加以援引,则这种做法是正当的。书籍建议命名这一可变的斜体=此;

Answer 2

Example 1 is a common pattern for maintaining the reference to the current instance. In a callback situation, like:

setTimeout(turtle.showBla, 0);

例1 例2将显示<代码>un specified,除非你在电话方面人工分配范围(如 j):

setTimeout($.proxy(turtle.showBla, turtle), 0);

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