关于禁止回车提交表单的js

//禁用Enter键表单自动提交

document.onkeydown = function(event) {

var target, code, tag;

if (!event) {

event = window.event; //针对ie浏览器

target = event.srcElement;

code = event.keyCode;

if (code == 13) {

tag = target.tagName;

if (tag == "TEXTAREA") { return true; }

else { return false; }

}

}

else {

target = event.target; //针对遵循w3c标准的浏览器，如Firefox

code = event.keyCode;

if (code == 13) {

tag = target.tagName;

if (tag == "INPUT") { return false; }

else { return true; }

}

}

};