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<body> <p><label>请选择一个图像文件：</label><input type="file" id="demo_input" /></p> <div id="demo_result"></div> <script type="text/javascript"> var result = document.getElementById("demo_result"); var input = document.getElementById("demo_input"); if(typeof FileReader === ‘undefined‘){ result.innerHTML = "<p class=‘warn‘>抱歉，你的浏览器不支持 FileReader</p>"; input.setAttribute(‘disabled‘,‘disabled‘); }else{ input.addEventListener(‘change‘,readFile,false); } function readFile(){ var file = this.files[0]; if(!/image\/\w+/.test(file.type)){ alert("请确保文件为图像类型"); return false; } var reader = new FileReader(); reader.readAsDataURL(file); reader.onload = function(e){ result.innerHTML = ‘<img src="‘+this.result+‘" />‘ } } </script> </body>
2,下面是我修改的，多图上传，本地预览:
<html> <head> <title>File Reader</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <style> body{ text-align:center; } #demo_result img{ border:2px solid #369; padding:3px; } p{ padding:20px 0; } .warn{ font-weight:bold; color:red; } </style> </head> <body> <p><label>请选择一个图像文件：</label> <input type="file" multiple="multiple" id="demo_input" /> </p> <div id="demo_result"></div> <script type="text/javascript"> var result = document.getElementById("demo_result"); var input = document.getElementById("demo_input"); if(typeof FileReader === ‘undefined‘){ result.innerHTML = "<p class=‘warn‘>抱歉，你的浏览器不支持 FileReader</p>"; input.setAttribute(‘disabled‘,‘disabled‘); }else{ input.addEventListener(‘change‘,readFile,false); } function readFile(){ for(var i=0;i<this.files.length;i++) { var file = this.files[i]; if(!/image\/\w+/.test(file.type)){ alert("请确保文件为图像类型"); return false; } var reader = new FileReader(); reader.readAsDataURL(file); reader.onload = function(e){ result.innerHTML+= ‘<img src="‘+this.result+‘" />‘; } } } </script> </body> </html>
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原文地址：http://www.cnblogs.com/zjx2011/p/4885851.html
