Form中的每个对象都保留了初始值,所以可以在提交表单时,遍历Form中对象,
检查对象当前的值与初始值是否一致,就判断出了表单是否被修改了。
示例代码 1 function IsFormChanged() 2 { 3 var isChanged = false; 4 var form = document.forms[0]; 5 for (var i = 0; i < form.elements.length; i++) 6 { 7 var element = form.elements[i]; 8 var type = element.type; 9 if (type == "text" || type == "hidden" || type == "textarea" || type == "button")10 { 11 if (element.value != element.defaultValue)12 { 13 isChanged = true;14 break;15 }16 }17 else if (type == "radio" || type == "checkbox")18 { 19 if (element.checked != element.defaultChecked)20 { 21 isChanged = true;22 break;23 }24 }25 else if (type == "select-one")26 { 27 for (var j = 0; j < element.options.length; j++)28 { 29 if (element.options[j].selected != element.options[j].defaultSelected)30 { 31 isChanged = true;32 break;33 }34 }35 }36 else37 { 38 //39 }40 }4142 return isChanged;43} 本文转自高海东博客园博客,原文链接:http://www.cnblogs.com/ghd258/archive/2007/01/12/618257.html,如需转载请自行联系原作者