js #js

将汉字转化为unicode编码

"dd".charCodeAr(0).toString(16)

替换选区内容为新内容, 并聚焦.md

var sel = window.getSelection();
            var range = document.createRange();
            let currentNode = this.anchorNode;
            let isStartNode = true;
            let lastPosition = this.anchorOffset;
            let lastNode = this.anchorNode;
            while(currentNode && currentNode.nodeType === 3) {
                // 这里将@之后的所有东西都替换
                range.setStart(currentNode, 0);
                const endOffset = currentNode.nodeValue.length;
                range.setEnd(currentNode, isStartNode ? this.anchorOffset : endOffset);
                let str = range.toString();
                let nodeValue = currentNode.nodeValue;
                if (/@/.test(str)) {
                    if (isStartNode) {
                        let prevValue = nodeValue.substring(0, this.anchorOffset);
                        this.anchorOffset = prevValue.lastIndexOf('@');
                    } else {
                        this.anchorOffset = nodeValue.lastIndexOf('@');
                    }
                    this.anchorNode = currentNode;
                    break;
                } else {
                    currentNode = currentNode.previousSibling;
                    isStartNode = false;
                }
            }
            range.setStart(this.anchorNode, this.anchorOffset);
            range.setEnd(lastNode, lastPosition);
            range.deleteContents();
            var img = document.createElement('img');
            img.ondragstart = 'return false';
            img.src = dataurl;
            img.alt = `@${item.text}`;
            img.title = item.text;
            img.style.cssText = 'vertical-align: middle';
            img.setAttribute('atid', item.id);
            range.insertNode(img);
            range.setStart(img.nextSibling, 0);
            range.setEnd(img.nextSibling, 0);
            range.collapse(true);
            sel.removeAllRanges();
            sel.addRange(range);
            myInputElem.focus();

检测变量是否是空字符串

typeof props.value == 'string' &&  props.value.trim() === ''

获取选取 chrome版.md

var selection = window.getSelection();
if(selection.rangeCount === 0) return;
e.preventDefault();
const range = selection.getRangeAt(0);
const selectString = range.toString().replace(/^\s*|\s*$/, '');