cocoscreator网页cope，复制到粘贴板，直接调用就可

/**

     * 复制网页字符串

     */

    public static webCopyString(str,errFunc:Function,successFunc:Function) {

        var input = str;

        const el = document.createElement('textarea');

        el.value = input;

        el.setAttribute('readonly', '');

        el.style.contain = 'strict';

        el.style.position = 'absolute';

        el.style.left = '-9999px';

        el.style.fontSize = '12pt'; // Prevent zooming on iOS

        const selection = getSelection();

        var originalRange = false;

        if (selection.rangeCount > 0) {

            originalRange = selection.getRangeAt(0);

        }

        document.body.appendChild(el);

        el.select();

        el.selectionStart = 0;

        el.selectionEnd = input.length;

        var success = false;

        try {

            success = document.execCommand('copy');

        } catch (err) {

            errFunc(err);

            console.error(err);

        }

        document.body.removeChild(el);

        if (originalRange) {

            selection.removeAllRanges();

            selection.addRange(originalRange);

        }

        successFunc();

        return success;

    }