js上传图片预览教程

js 上传图片预览

css

.gjimg li{
    float:left;
    width:265px;
    margin-left:100px;
    height:283px;
    overflow:hidden;
}

.gjimg li span{
    font-size:14px;
    color:#000;
    margin-left:65px;
    cursor:pointer;
}

.gjimg li .afile{
    width:230px;
    height: 230px;
    line-height: 230px;
    position: relative;
    cursor: pointer;
    color: #000;
    font-size:16px;
    text-align:center;
    background: #e5e5e5;
    border: 1px solid #d4d4d4;
    border-radius: 1px;
    overflow: hidden;
    display: inline-block;
    *display: inline;
    *zoom: 1
}

.gjimg li .afile input{
    position: absolute;
    font-size: 100px;
    right: 0;
    top: 0;
    opacity: 0;
    filter: alpha(opacity=0);
    cursor: pointer;
    width:230px;
    height: 230px;
}

#xmtanimg{
    width:232px;
    height:232px;
    position:relative;
    top:-232px;display:none;
}

if (typeof filereader == 'undefined') {
    document.getelementbyid("xmtandiv").innerhtml = "

当前不支持filereader接口

"; //使选择控件不可操作 document.getelementbyid("xdatanfileimg").setattribute("disabled", "disabled"); } function xmtanuploadimg(obj) { var file = obj.files[0]; console.log(obj);console.log(file); console.log("file.size = " + file.size); //file.size 单位为byte var reader = new filereader(); //读取文件过程方法 reader.onloadstart = function (e) { console.log("开始读取...."); } reader.onprogress = function (e) { console.log("正在读取中...."); } reader.onabort = function (e) { console.log("中断读取...."); } reader.onerror = function (e) { console.log("读取异常...."); } reader.onload = function (e) { console.log("成功读取...."); var img = document.getelementbyid("xmtanimg"); img.style="display:block;"; img.src = e.target.result; //或者 img.src = this.result; //e.target == this } reader.readasdataurl(file); }