CSS：修改输入框placeholder样式

<div class="multiple_search">
	<input type="text" class="search_input" id="search-input" placeholder="请输入地名">
</div>

.multiple_search .search_input::-webkit-input-placeholder { /*Webkit browsers*/
    color: #fff;
    font-size:18px;
}

.multiple_search .search_input:-moz-placeholder { /*Mozilla Firefox 4 to 8*/
    color: #fff;
    font-size:18px;
}

.multiple_search .search_input::moz-placeholder { /*Mozilla Firefox 19+*/
    color: #fff;
    font-size:18px;
}

.multiple_search .search_input:-ms-input-placeholder { /*Internet Explorer 10+*/
    color: #fff;
    font-size:18px;
}