javascript 过滤页面彻底过滤输入时的特殊字符

function showKeyPress(event) {
event = (event) ? event : window.event;
return checkSpecificKey(event.keyCode);
}
function checkSpecificKey(keyCode) {
var specialKey = "[`~!#$^&*()=|{}':;',\\[\\].<>/?~！#￥……&*（）——|{}【】‘；：”“'。，、？]‘'";//Specific Key list
var realkey = String.fromCharCode(keyCode);
var flag = false;
flag = (specialKey.indexOf(realkey) >= 0);
if (flag) {
return false;
}
return true;
}