Javascript外部范围变量访问 [英] Javascript outer scope variable access

问题描述

OperationSelector = function(selectElement) {
    this.selectElement = selectElement;
}

OperationSelector.prototype.populateSelectWithData = function(xmlData) {
    $(xmlData).find('operation').each(function() {
        var operation = $(this);
        selectElement.append('<option>' + operation.attr("title") + '</option>');               
    });
}

如何在迭代块中访问OperationSelector.selectElement？

How could I access OperationSelector.selectElement in iteration block ?

推荐答案

在迭代函数之前将其分配给函数作用域中的局部变量。然后你可以在其中引用它：

Assign it to a local variable in the function scope before your iteration function. Then you can reference it within:

OperationSelector = function(selectElement) { 
    this.selectElement = selectElement; 
} 

OperationSelector.prototype.populateSelectWithData = function(xmlData) { 
    var os = this;
    $(xmlData).find('operation').each(function() { 
        var operation = $(this); 
        os.selectElement.append(new Option(operation.attr("title")));
    }); 
}

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