js 实现文本内容进行复制

# 复制内容的一个函数  

function copyTextToClipboard(text) {
    var textArea = document.createElement("textarea");
    textArea.style.position = 'fixed';
    textArea.style.top = 0;
    textArea.style.left = 0;
    textArea.style.width = '2em';
    textArea.style.height = '2em';
    textArea.style.padding = 0;
    textArea.style.border = 'none';
    textArea.style.outline = 'none';
    textArea.style.boxShadow = 'none';
    textArea.style.background = 'transparent';
    textArea.value = text;
    document.body.appendChild(textArea);
    textArea.select();
    try {
        var successful = document.execCommand('copy');
        var msg = successful ? 'successful' : 'unsuccessful';
        console.log('Copying text command was ' + msg);
    } catch (err) {
        console.log('Oops, unable to copy');
    }
    document.body.removeChild(textArea);
    }