<input type="text" name="sj" id="sj" size="90" class="form-control" onkeypress="intOnly()" maxlength="11">
//只允许输入数字,左右移动键,删除键,回车键
//author:larger
function intOnly(){
var codeNum=event.keyCode;
if(codeNum==8||codeNum==37||codeNum==39||(codeNum>=48&&codeNum<=57)){
event.returnValue=codeNum;
}else{
event.returnValue=false;
}
}
限制长度用maxlength="11"