<script>

//helper function to create the form
function getNewSubmitForm(){
var submitForm = document.createElement("FORM");
document.body.appendChild(submitForm);
submitForm.method = "POST";
return submitForm;
}

//helper function to add elements to the form
function createNewFormElement(inputForm, elementName, elementValue){
var newElement = document.createElement("<input name=‘"+elementName+"‘ type=‘hidden‘>");
inputForm.appendChild(newElement);
newElement.value = http://www.mamicode.com/elementValue;
return newElement;
}

//function that creates the form, adds some elements
//and then submits it
function createFormAndSubmit(){
var submitForm = getNewSubmitForm();
createNewFormElement(submitForm, "field1", "somevalue");
createNewFormElement(submitForm, "field2", "somevalue");
submitForm.action= "someURL";
submitForm.submit();
}
</script>

<input type="button" value="http://www.mamicode.com/Click to create form and submit" onclick="createFormAndSubmit()">

http://blog.csdn.net/honey_claire/article/details/7658490

http://bbs.csdn.net/topics/300212131

http://bbs.csdn.net/topics/390693892

http://www.aa25.cn/code/458.shtml