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Easily implement js image preview function_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:19:271143browse

The example in this article describes the method of implementing image preview in js. I wrote one before. The code is relatively simple and I would like to share it with you for your reference. The details are as follows:

1. Effect preview

Rendering:

2. Implementation code: 

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>js图片预览功能</title>
<script language=javascript>
function previewFile() {
 var preview = document.querySelector('img');
 var file  = document.querySelector('input[type=file]').files[0];
 var reader = new FileReader();
 reader.onloadend = function () {
  preview.src = reader.result;
 }
 if (file) {
  reader.readAsDataURL(file);
 } else {
  preview.src = "";
 }
}
</script>
</head>
<body>
<input type="file" onchange="previewFile()"><br>
<img src="" height="200" width="300" alt="Image preview..."/>
</body>
</html>

I hope this article will be helpful to everyone’s JavaScript programming design.

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