[contenteditable="true"], input, textarea {
-webkit-user-select: auto!important;
-khtml-user-select: auto!important;
-moz-user-select: auto!important;
-ms-user-select: auto!important;
-o-user-select: auto!important;
user-select: auto!important;
}
加入这段css代码把默认的样式覆盖掉即可
原文：https://www.cnblogs.com/gitByLegend/p/11160830.html