《Javascript高级程序设计》读书笔记之闭包

闭包

function createComparisonFunction(propertyName) {
    return function (object1, object2) {
        var value1 = object1[propertyName];
        var value2 = object2[propertyName];

        if (value1 < value2) {
            return -1;
        } else if (value1 > value2) {
            return 1;
        } else {
            return 0;
        }
    };
}
//创建函数
var compare = createComparisonFunction("name");
//调用函数
var result = compare({ name: "Jim" }, { name: "Jack" });
//解除对匿名函数的引用，以便释放内存
compare = null;

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