图片上传提交前，图片显示在页面上

< div class= "upload_box" >

< b > 上传图片 b >

< input type= "file" name= "file" id= "file" accept= "image/*" onchange= "imgChange(this);" />

< div id= "preview" >

< img id= "imghead" src= "/style/images/blank.gif" width= "260" height= "180" />

div >

div >

< script type= "text/javascript" >

// 选择图片显示

function imgChange( obj) {

//获取点击的文本框

var file = document. getElementById( "file");

var imgUrl = window. URL. createObjectURL( file. files[ 0]);

var img = document. getElementById( 'imghead');

img. setAttribute( 'src', imgUrl); // 修改img标签src属性值

};

< / script >