var evt = document.createEvent("KeyboardEvent");
evt.initKeyEvent ("keypress", true, true, window,
0, 0, 0, 0,
13, 13);
var canceled = !body.dispatchEvent(evt);
文档:https://developer.mozilla.org/en-US/docs/Web/API/event.initKeyEvent
对于基于 Webkit 的浏览器,初始化可能有点不同
initKeyboardEvent(in DOMString typeArg,
in boolean canBubbleArg,
in boolean cancelableArg,
in views::AbstractView viewArg,
in DOMString keyIdentifierArg,
in unsigned long keyLocationArg,
in boolean ctrlKeyArg,
in boolean shiftKeyArg,
in boolean altKeyArg,
in boolean metaKeyArg,
in boolean altGraphKeyArg);