window.onload = function(){
var input = document.getElementById("file_input");
var result,div;
if(typeof FileReader===\'undefined\'){
result.innerHTML = "抱歉，你的浏览器不支持 FileReader";
input.setAttribute(\'disabled\',\'disabled\');
}else{
input.addEventListener(\'change\',readFile,false);
}
function readFile(){
for(var i=0;i<this.files.length;i++){
if (!input[\'value\'].match(/.jpg|.gif|.png|.bmp/i)){ //判断上传文件格式
return alert("上传的图片格式不正确，请重新选择")
}
var reader = new FileReader();
reader.readAsDataURL(this.files[i]);
reader.onload = function(e){
result = \'<div id="result"><img src="\'+this.result+\'" alt=""/></div>\';
div = document.createElement(\'div\');
div.innerHTML = result;
document.getElementById(\'body\').appendChild(div);
}
}
}
}
</script>
</head>
<body id=\'body\'>
<div class="container">
<label>请选择一个图像文件：</label>
<input type="file" id="file_input" multiple/>
</div>