JS获取当前选中内容

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this.content=null;<br>this.range = null;getHtml (win) {       if (win) {         let range = {};         const createFragment = (html) => {           if (html.toString()) {             const div = document.createElement('div');             div.appendChild(html.cloneContents());             this.content = div.innerHTML;             this.range = div;           } else {             this.range = this.content = null;           }         };         if (win.getSelection) {           try {             range = win.getSelection().getRangeAt(0);             createFragment(range);           } catch (e) {           }         } else if (win.document.getSelection) {           try {             range = win.document.getSelection().getRangeAt(0);             createFragment(range);           } catch (e) {           }         } else if (win.document.selection) {           try {             range = win.document.selection.createRange();             createFragment(range);           } catch (e) {           }         }       };     },<br><br>getHtml（window）

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