如何在javascript中复制变量的值 [英] How to copy the value of variable in javascript

问题描述

我正在尝试将字符串变量复制到剪贴板。

I'm trying to copy string variable to clipboard.

我可以找到很多示例，这些示例从<中复制值。输入>或< p>标签，但是如果我对变量进行了更改，那么我的问题是我想复制它，例如本例

I could find a lot of examples that copy the values from < input > or < p > tags, But my problem in case I make a changes on variable then I want to copy it such as this example

var num1= getNum1();
var num2= getNum2();
var result = ((num1*num2)/3)-1
...//copy result value
alert("your results has been copied");

推荐答案

var getNum1 = function() {
  return 1;
};

var getNum2 = function() {
  return 2;
};

var num1 = getNum1();
var num2 = getNum2();
var result = ((num1 * num2) / 3) - 1;

var executeCopy = function() {
  var copyhelper = document.createElement("input");
  copyhelper.className = 'copyhelper'
  document.body.appendChild(copyhelper);
  copyhelper.value = result;
  copyhelper.select();
  document.execCommand("copy");
  document.body.removeChild(copyhelper);
};

document.getElementById('mybutton').addEventListener('click', function() {
  executeCopy();

  alert("your results has been copied");
});

.copyhelper {
  position: absolute;
}

<button id='mybutton'>Copy to clipboard</button>

希望有帮助！

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