var newElement=function(){
var newElem = document.createElement( "p ");
newElem.setAttribute( "id ", "newP ");
var newText = document.createTextNode( "This is the second paragraph. ");
newElem.appendChild(newText);
document.getElementById( "paragraph1 ").appendChild(newElem);
}
在运行这个函数的时候,下面的html还没有生成,document.getElementById( "paragraph1 ")无法获取到,就出错