把页面某内容放入粘贴板中
在很多的网站，相信大家都有看到，点击一个按钮之后，就把对应的代码或者地址放置到了粘贴板中，这种操作粘贴板的方法是什么呢，下面就来跟大家分享一下；
1 function copyToClipboard(elem) { 2 // create hidden text element, if it doesn't already exist 3 var targetId = "_hiddenCopyText_"; 4 var isInput = elem.tagName === "INPUT" || elem.tagName === "TEXTAREA"; 5 var origSelectionStart, origSelectionEnd; 6 if (isInput) { 7 // can just use the original source element for the selection and copy 8 target = elem; 9 origSelectionStart = elem.selectionStart; 10 origSelectionEnd = elem.selectionEnd; 11 } else { 12 // must use a temporary form element for the selection and copy 13 target = document.getElementById(targetId); 14 if (!target) { 15 var target = document.createElement("textarea"); 16 target.style.position = "absolute"; 17 target.style.left = "-9999px"; 18 target.style.top = "0"; 19 target.id = targetId; 20 document.body.appendChild(target); 21 } 22 target.textContent = elem.textContent; 23 } 24 // select the content 25 var currentFocus = document.activeElement; 26 target.focus(); 27 target.setSelectionRange(0, target.value.length); 28 // copy the selection 29 var succeed; 30 try { 31 succeed = document.execCommand("copy"); 32 } catch(e) { 33 succeed = false; 34 } 35 // restore original focus 36 if (currentFocus && typeof currentFocus.focus === "function") { 37 currentFocus.focus(); 38 } 39 if (isInput) { 40 // restore prior selection 41 elem.setSelectionRange(origSelectionStart, origSelectionEnd); 42 } else { 43 // clear temporary content 44 target.textContent = ""; 45 } 46 return succeed; 47 } 48 49 //调用 50 copyToClipboard(document.getElementById("name"));//这里传入的参数是要把哪一个标签里面的内容使用，就放入哪个元素即可；
操作系统的东西，当然要原生的js兼容性更好了赛；看起来还是很方便吧！
