<script type="text/javascript">	function copyTextAreaCt()		{			var oContent=document.getElementById("content");			oContent.select(); // 选择对象			document.execCommand("Copy"); // 执行浏览器复制命令			alert("复制完毕，可粘贴");		}	</script><textarea cols="20" rows="10" id="content" value="">This is a paragraph......</textarea><input type="button" onClick="copyTextAreaCt()" value="http://www.mamicode.com/点击复制代码" />

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; //selectionStart光标的开始位置        origSelectionEnd = elem.selectionEnd; //selectionEnd 光标的结束位置    } 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;//获取当前页面活动的元素    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 恢复之前的选择        elem.setSelectionRange(origSelectionStart, origSelectionEnd);    } else {        // clear temporary content        target.textContent = "";    }    return succeed;} //直接调用这个方法：copyToClipboard(document.getElementById("name"));