最近在代码中经常看到bind关键词，之前没用过啊，这里记录下。从微软复制过来的例子：

// Define the original function.
var checkNumericRange = function (value) {
    if (typeof value !== 'number')
        return false;
    else
        return value >= this.minimum && value <= this.maximum;
}

// The range object will become the this value in the callback function.
var range = { minimum: 10, maximum: 20 };

// Bind the checkNumericRange function.
var boundCheckNumericRange = checkNumericRange.bind(range);

// Use the new function to check whether 12 is in the numeric range.
var result = boundCheckNumericRange (12);
document.write(result);

// Output: true

http://msdn.microsoft.com/zh-cn/library/ff841995

bind还有其他用法，感觉使用bind代码会失去可读性啊？