//html部分
<div class="">
<label class="col-sm-2 control-label">活动图片</label>
<div class="col-sm-9">
<img id="img0" style="width: 100px;height: 100px" src=""><input type="file" name="file" id="file0" /><span style='color:red' id="span_flie0"></span>
</div>
</div>
//JS部分
<script>
//jquery上传图片前预览
$("#file0").change(function(){
var objUrl = getObjectURL(this.files[0]) ;
console.log("objUrl = "+objUrl) ;
if (objUrl) {
$("#img0").attr("src", objUrl) ;
}
}) ;
//建立一個可存取到該file的url
function getObjectURL(file) {
var url = null ;
if (window.createObjectURL!=undefined) { // basic
url = window.createObjectURL(file) ;
} else if (window.URL!=undefined) { // mozilla(firefox)
url = window.URL.createObjectURL(file) ;
} else if (window.webkitURL!=undefined) { // webkit or chrome
url = window.webkitURL.createObjectURL(file) ;
}
return url ;
}
</script>