JavaScript中DOM常用的方法有哪些

var method = document.getElementById('method');

var input = document.createElement('input');       

method.appendChild('input');

method.insertBefore(input,method.childNodes[1]);

method.hasChildNodes();

method.removeChild(method.childNodes[1]);

method.replaceChild(input,method.childNodes[1]);

var relation=document.getElementById('relation');       

var newRel=relation.cloneNode(true);

var ps=document.getElementsByTagName('p');          

console.log(ps.length);"

var sexs=document.getElementsByName('user');          

console.log(sexs);"

var b=document.createElement('b');

var classAttr=document.createAttribute('class');

classAttr.value='on';"

var newtext=document.createTextNode('First');

document.write('哈哈');

document.writeln('哈哈');

document.open();

document.close();