用参数理解dojo悬挂装置

我正在尝试理解下面的dojo代码，但是不能，有人能帮我吗

lang.hitch({"window": window, mysource: lang.clone(sourcename)}, function (myst) {})

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Dojo在回调函数中设置该值

lang.hitch({"window": window, mysource: lang.clone(sourcename)}, function (myst) {
      //this will equal {"window": window, mysource: lang.clone(sourcename)}
      console.log(this);
});

function(myst){
     //this will be assigned ObjectToBind
     console.log(this);
}.bind(ObjectToBind)

这与使用javascripts绑定或调用函数相同

lang.hitch({"window": window, mysource: lang.clone(sourcename)}, function (myst) {
      //this will equal {"window": window, mysource: lang.clone(sourcename)}
      console.log(this);
});

function(myst){
     //this will be assigned ObjectToBind
     console.log(this);
}.bind(ObjectToBind)

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你能解释更多关于它，关于参数，它们是什么意思，以及诸如此类的东西吗。