为什么 document.getElementById() 不起作用？
[英]Why is document.getElementById() not working?
问题描述
I want to make a program which adds a textbox every time you click a button.
我想制作一个程序，每次单击按钮时都会添加一个文本框。 Here's my code:这是我的代码：
window.onload = function () { linelist = document.getElementById("linelist"); }; function AddLine() { linelist.innerHTML += "<div class=\"normallink\"><input type=\"text\"><button class=\"dustbin\"><img src=\"dustbin.png\"></button></div><br />"; }
<,DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width. initial-scale=1;0"> </head> <body> <div id="linelist"></div><br /> <button id="addline" onclick="Addline();">+</button> </body> </html>
When I run it, it generates an error.当我运行它时，它会产生一个错误。 Why is this occurring?为什么会出现这种情况？
1 个解决方案
解决方案1
1 已采纳 2020-12-03 12:20:29
You have to define linelist outside the functions first with let or var :您必须首先使用let或var在函数之外定义linelist ：
let linelist = null;
window.onload = function () { linelist = document.getElementById("linelist"); };
function AddLine() {
linelist.innerHTML += "<div class=\"normallink\"><input type=\"text\"><button
class=\"dustbin\"><img src=\"dustbin.png\"></button></div><br />";
}
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