最近做了一个前端项目，其中有需求：通过button直接把input或者textarea里的值复制到粘贴板里。下面小编把我实现思路及代码分享给大家，大家可以直接引入项目中。

具体代码如下所示：

function copyToClipboard(elem) {

// create hidden text element, if it doesn't already exist

var targetId = "_hiddenCopyText_";

var isInput = elem.tagName === "INPUT" || elem.tagName === "TEXTAREA";

var origSelectionStart, origSelectionEnd;

if (isInput) {

// can just use the original source element for the selection and copy

target = elem;

origSelectionStart = elem.selectionStart;

origSelectionEnd = elem.selectionEnd;

} else {

// must use a temporary form element for the selection and copy

target = document.getElementById(targetId);

if (!target) {

var target = document.createElement("textarea");

target.style.position = "absolute";

target.style.left = "-9999px";

target.style.top = "0";

target.id = targetId;

document.body.appendChild(target);

}

target.textContent = elem.textContent;

}

// select the content

var currentFocus = document.activeElement;

target.focus();

target.setSelectionRange(0, target.value.length);

// copy the selection

var succeed;

try {

succeed = document.execCommand("copy");

} catch(e) {

succeed = false;

}

// restore original focus

if (currentFocus && typeof currentFocus.focus === "function") {

currentFocus.focus();

}

if (isInput) {

// restore prior selection

elem.setSelectionRange(origSelectionStart, origSelectionEnd);

} else {

// clear temporary content

target.textContent = "";

}

return succeed;

}

我们可以这样直接调用这个方法：

copyToClipboard(document.getElementById("name"));

这样id为name的值进入了粘贴板了。

关于JavaScript实现复制内容到粘贴板代码小编就给大家介绍到这里，希望对大家有所帮助！