JavaScript Base64 作为文件上传的实例代码解析
例如我们用某些裁剪插件得到的图片是
<imgsrc="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAkCAYAAABIdFAMAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAHhJREFUeNo8zjsOxCAMBFB/KEAUFFR0Cbng3nQPw68ArZdAlOZppPFIBhH5EAB8b+Tlt9MYQ6i1BuqFaq1CKSVcxZ2Acs6406KUgpt5/LCKuVgz5BDCSb13ZO99ZOdcZGvt4mJjzMVKqcha68iIePB86GAiOv8CDADlIUQBs7MD3wAAAABJRU5ErkJggg==">
这样的，那这样的文件怎样在from表单上传（当然我是举例，大部分的裁剪插件都是有内置的）
首先需要吧base64流转换成blob对象，文件对象都继承它。
函数如下：
functiongetBlobBydataURI(dataURI,type){
varbinary=atob(dataURI.split(',')[1]);
vararray=[];
for(vari=0;i<binary.length;i++){
array.push(binary.charCodeAt(i));
}
returnnewBlob([newUint8Array(array)],{type:type});
}
那么剩下的就作为文件上传就ok
var$Blob=getBlobBydataURI(base64Data,'image/png');
varformData=newFormData();
formData.append("files",$Blob,"file_"+Date.parse(newDate())+".png");
全部代码是这样子的：
<!DOCTYPEhtml>
<html>
<head>
<metahttp-equiv="Content-Type"content="text/html;charset=utf-8"/>
<title>上传用例</title>
<metacontent='width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no'name='viewport'>
<scripttype="text/javascript">
/**
*根据base64内容取得bolb
*
*@paramdataURI
*@returnsBlob
*/
functiongetBlobBydataURI(dataURI,type){
varbinary=atob(dataURI.split(',')[1]);
vararray=[];
for(vari=0;i<binary.length;i++){
array.push(binary.charCodeAt(i));
}
returnnewBlob([newUint8Array(array)],{type:type});
}
/**
*上传
*/
functionupload(){
//base64转blob
var$Blob=getBlobBydataURI(document.getElementsByTagName("img")[0].currentSrc,'image/jpeg');
varformData=newFormData();
formData.append("files",$Blob,"file_"+Date.parse(newDate())+".jpeg");
//组建XMLHttpRequest上传文件
varrequest=newXMLHttpRequest();
//上传连接地址
request.open("POST","www.xxx.com");
request.onreadystatechange=function()
{
if(request.readyState==4)
{
if(request.status==200){
console.log("上传成功");
}else{
console.log("上传失败,检查上传地址是否正确");
}
}
}
request.send(formData);
}
</script>
</head>
<body>
<buttononclick="upload()">上传测试</button>
<br/>
上传的图片:
<imgsrc="data:image/jpeg;base64,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"/>
</body>
</html>
以上所述是小编给大家介绍的JavaScriptBase64作为文件上传的实例代码解析，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对毛票票网站的支持！