Element: prepend() method
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.
Thuộc tính Element.prepend() method inserts a set of
Node objects or strings before the first child
of the Element. Strings are inserted as
equivalent Text nodes.
Cú pháp
js
prepend(param1)
prepend(param1, param2)
prepend(param1, param2, /* …, */ paramN)
Tham số
param1, …,paramN-
A set of
Nodeobjects or strings to insert.
Giá trị trả về
None (undefined).
Ngoại lệ
HierarchyRequestErrorDOMException-
Thrown when the node cannot be inserted at the specified point in the hierarchy.
Ví dụ
Prepending an element
js
let div = document.createElement("div");
let p = document.createElement("p");
let span = document.createElement("span");
div.append(p);
div.prepend(span);
console.log(div.childNodes); // NodeList [ <span>, <p> ]
Prepending text
js
let div = document.createElement("div");
div.append("Some text");
div.prepend("Headline: ");
console.log(div.textContent); // "Headline: Some text"
Prepending an element and text
js
let div = document.createElement("div");
let p = document.createElement("p");
div.prepend("Some text", p);
console.log(div.childNodes); // NodeList [ #text "Some text", <p> ]
The prepend method is unscopable
The prepend() method is not scoped into the with statement.
See Symbol.unscopables for more information.
js
let div = document.createElement("div");
with (div) {
prepend("foo");
}
// ReferenceError: prepend is not defined
Đặc tả kỹ thuật
| Specification |
|---|
| DOM # ref-for-dom-parentnode-prepend① |