2017年9月30日
JS-- 小细节--你悟到了什么？
摘要： var p = {// x and y are regular read-write data properties.x: 1.0,y: 1.0,r:function () { return Math.sqrt( x*x + y*y); }, }; 如果调用 p.r()，会报错的， r函数里面必须要 阅读全文
posted @ 2017-09-30 15:09 流畅的心情 阅读(228) 评论(2) 推荐(0)
JS--Testing Properties 判断属性是否在对象里
摘要： Testing Properties To check whether an object has a property with a given name. You can do this with the in operator, with the hasOwnProperty() and pr 阅读全文
posted @ 2017-09-30 14:09 流畅的心情 阅读(621) 评论(0) 推荐(0)
JS--Logical AND (&&) 逻辑与
摘要： Logical AND (&&) The && operator can be understood at three different levels. At the simplest level, when used with boolean operands, && performs the 阅读全文
posted @ 2017-09-30 10:59 流畅的心情 阅读(5020) 评论(0) 推荐(1)