我怎样才能让这个javascript函数发出一个换行符

Question

okay I have an a script running that process a lot of data basically I am using the line below

 document.getElementById("message").innerHTML = JSON.stringify(stringbuild.hello);

problem is every time this line is send to message textbox it just overwrites the previous line from a previous output .

how can I make each output emit to a new empty line and keep any other previous data in the textbox

Answer 1

If the 'message' element is a regular HTML element (eg a <div> ), try would work:

document.getElementById("message").innerHTML += "<br>" + JSON.stringify(stringbuild.hello);

• The += is an ' augmented ' assignment operator which appends the current string with whatever value is provided to the right.
• The <br> is an html line break character, used to make place the the new string directly underneath the previous string.

For an input element <input type="text"> or <textarea> , use this:

document.getElementById("message").value += "\n" + JSON.stringify(stringbuild.hello);

• The value property is used to access the current value of the input element, and should be used instead of innerHTML .
• The \\n is the escape sequence for a new line character.

Demonstration

Answer 2

In a <textbox> use \\n which is a newline character:

node = document.getElementById("message");
node.innerHTML += JSON.stringify(stringbuild.hello) + '\n';

Don't use <br /> in a <textbox> .

And add it always at the end of the line, or you'll have the first line being empty.