Add text to text area using javascript

Question

如何使用javascript在textarea中为已写入的文本添加自定义文本？谢谢...

Answer 1

function addText(elId,text) {
    document.getElementById(elId).value += text;
}

or:

function addText(elId,text) {
    var obj = document.getElementById(elId);
    var txt = document.createTextNode(text);
    obj.appendChild(txt);
}

Answer 2

myTextarea.value += "text to add to the textarea"

Answer 3

Grab the existing text in the textarea (the element's .value)

Combine your existing text (append, prepend, insert, or whatever you need)

Write the result back to the textarea.

Tah-dah!