css内容不可选择 不可选取

    user-select: text;
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;

css强制换行

 word-wrap: break-word;
 word-break: break-all;
 white-space: pre-wrap; 

css只允许输入字符串

-webkit-user-modify: read-write-plaintext-only;
    -moz-user-modify: read-write-plaintext-only;
    user-modify: read-write-plaintext-only;