摘要:
示例1:关于事件对象MSIE:window.event, cancelBubble, returnValue,srcElement, button(鼠标按键,1,4,2,左中右)W3C:event, stopPropagation(), preventDefault(), target, butto... 阅读全文
摘要:
示例1:var abc; console.log(abc === undefined); console.log(abc === null); console.log(typeof abc === undefined); console.log(typeof abc === 'undefin... 阅读全文