网页屏蔽Backspace事件,输入框不屏蔽
document.onkeydown = function (e) { var code; if (!e){ var e = window.event;} if (e.keyCode){ code = e.keyCode;} else if (e.which){ code = e.which;} //BackSpace 8; if ( (event.keyCode == 8) && ((event.srcElement.type != "text" && event.srcElement.type != "textarea" && event.srcElement.type != "password") || event.srcElement.readOnly == true ) ) { event.keyCode = 0; event.returnValue = false; } return true; };