function assignFilePreviews() {
    $('input[data-previewable=\"true\"]').change(function() {
        var prvCnt = $(this).attr('data-preview-container');
        if (prvCnt) {
            if (this.files && this.files[0]) {
                var reader = new FileReader();
                reader.onload = function(e) {
                    var img = $('<img>');
                    img.attr('src', e.target.result);
                    img.error(function() {
                        $(prvCnt).html('');
                    });
                    $(prvCnt).html('');
                    img.appendTo(prvCnt);
                }
                reader.readAsDataURL(this.files[0]);
            }
        }
    });
}
$(document).ready(function() {
    assignFilePreviews();
});

HTML格式

<input type="file" data-previewable="true" data-preview-container=".prd-img-prv" />
<div class = "prd-img-prv"></div>

当选择了无效类型（例如pdf）的文件时，这也会处理这种情况

imgInp.oncange=evt=>{const[file]=imgInp.fileif（文件）{blah.src=URL.createObjectURL（文件）}}<form runat=“server”><input accept=“image/*”type='file'id=“imgInp”/><img id=“blah”src=“#”alt=“your image”/></form>

短双衬套

这是cmlevy答案的大小改进-尝试

<input-type=file oninput=“pic.src=window.URL.createObjectURL（this.files[0]）”><img id=“pic”/>

这里有一种在上传前使用纯javascript预览图像的简单方法；

//profile_change is the id of the input field where we choose an image
document.getElementById("profile_change").addEventListener("change", function() {

//Here we select the first file among the selected files.
const file = this.files[0];

/*here i used a label for the input field which is an image and this image will 
  represent the photo selected and profile_label is the id of this label */
const profile_label = document.getElementById("profile_label");

//Here we check if a file is selected
if(file) {
    //Here we bring in the FileReader which reads the file info. 
    const reader = new FileReader();
    
    /*After reader loads we change the src attribute of the label to the url of the 
    new image selected*/
    reader.addEventListener("load", function() {
        dp_label.setAttribute("src", this.result);
    })

    /*Here we are reading the file as a url i.e, we try to get the location of the 
    file to set that as the src of the label which we did above*/
    reader.readAsDataURL(file);

}else {
    //Here we simply set the src as default, whatever you want if no file is selected.
    dp_label.setAttribute("src", "as_you_want")
}
});

这里是HTML；

<label for="profile_change">
            <img title="Change Profile Photo" id="profile_label" 
             src="as_you_want" alt="DP" style="height: 150px; width: 150px; 
               border-radius: 50%;" >
</label>
<input style="display: none;" id="profile_change" name="DP" type="file" class="detail form-control">

LeassTaTT的答案在FF和Chrome等“标准”浏览器中运行良好。IE的解决方案存在，但看起来有所不同。此处描述了跨浏览器解决方案：

在HTML中，我们需要两个预览元素，img用于标准浏览器，div用于IE

HTML格式：

<img id="preview" 
     src="" 
     alt="" 
     style="display:none; max-width: 160px; max-height: 120px; border: none;"/>

<div id="preview_ie"></div>

在CSS中，我们指定了以下特定于IE的内容：

CSS:

#preview_ie {
  FILTER: progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)
}  

在HTML中，我们包括标准和特定于IE的Javascript：

<script type="text/javascript">
  {% include "pic_preview.js" %}
</script>  
<!--[if gte IE 7]> 
<script type="text/javascript">
  {% include "pic_preview_ie.js" %}
</script>

pic_preview.js是LeassTaTT答案中的Javascript。将$（“#blah”）替换为$（“#预览”），并添加$（“＃预览”）.show（）

现在，特定于IE的Javascript（pic_preview_IE.js）：

function readURL (imgFile) {    
  var newPreview = document.getElementById('preview_ie');
  newPreview.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = imgFile.value;
  newPreview.style.width = '160px';
  newPreview.style.height = '120px';
}    

就是这样。适用于IE7、IE8、FF和Chrome。请在IE9中测试并报告。IE预览的想法可以在这里找到：http://forums.asp.net/t/1320559.aspx

http://msdn.microsoft.com/en-us/library/ms532969（v=vs.85）.aspx

<img id="blah" alt="your image" width="100" height="100" />
<input type="file" name="photo" id="fileinput" />
<script>
$('#fileinput').change(function() {
var url = window.URL.createObjectURL(this.files[0]);
 $('#blah').attr('src',url);
});
</script>