支持文本框input 和textarea等向光標(biāo)位置插入內(nèi)容

insertText(obj, str) {
            if (document.selection) {
                var sel = document.selection.createRange();
                sel.text = str;
            } else if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') {
                var startPos = obj.selectionStart,
                    endPos = obj.selectionEnd,
                    cursorPos = startPos,
                    tmpStr = obj.value;
                obj.value = tmpStr.substring(0, startPos) + str + tmpStr.substring(endPos, tmpStr.length);
                cursorPos += str.length;
                obj.selectionStart = obj.selectionEnd = cursorPos;
                //選擇焦點(diǎn)的位置
                obj.setSelectionRange(obj.selectionStart, obj.selectionStart);
            } else {
                obj.value += str;
            }
            //重新獲得焦點(diǎn)
            obj.focus();
        }

使用方法

var templateContent = document.getElementById("txtRemark");
var content = "test";
insertText(templateContent, content);