input消除默认，代码如下

　　

   input{

            -webkit-tap-highlight-color: rgba(255, 255, 255, 0); 

            -webkit-user-select: none;

            -moz-user-focus: none;

            -moz-user-select: none;

            -webkit-appearance:none;

            outline: none;

            border: none;

}