Hanyar shiga XML DOM insertBefore()

Tafiyar da bayanai

insertBefore() Hanyar shiga a cikin abin da ke kusa a cikin abin da ke kusa.

Rarraba:Idan newchild ya yi wuri a cikin tsaɗan, za a kama shi kafin.

Dokar

nodeObject.insertBefore(newchild,existingnode,

)

Bayanai da ke cikin teknoloji

Shirin

Tasiri da a ciki "books.xml", ana shi ɗaya ɗin <book> a kafa, kuma ta shi shi ɗaya ɗin <book> da ke kusa:

var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
   if (this.readyState == 4 && this.status == 200) {
       myFunction(this);
   }
};
xhttp.open("GET", "books.xml", true);
xhttp.send();
function myFunction(xml) {
    var xmlDoc = xml.responseXML;
    var newNode = xmlDoc.createElement("book");
    var x = xmlDoc.documentElement;
    var y = xmlDoc.getElementsByTagName("book");
    document.getElementById("demo").innerHTML =
    "Book elements before: " + y.length + "<br>";
    x.insertBefore(newNode, y[3]);
    document.getElementById("demo").innerHTML +=
    "Book elements after: " + y.length;
}

亲自试一试

浏览器支持

所有主流浏览器都支持 insertBefore() 方法。