placeholder样式，ie input框眼镜图标，ie文档兼容模式

1.设置placeholder的样式，IE input 去掉文本框的叉叉和密码输入框的眼睛图标

.m-input::-webkit-input-placeholder{color: rgba(0,0,0,0.2);}
.m-input::-moz-input-placeholder{color: rgba(0,0,0,0.2);}
.m-input::-ms-input-placeholder{color: rgba(0,0,0,0.2);}
.m-input::-ms-clear,.m-input::-ms-reveal{display:none;}

2.IE文档兼容模式的定义

 <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1"/>