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upload-multiple-picture.html
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upload-multiple-picture.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>上传多张图片</title>
<style>
.add-pic{ width: 160px; height: 200px; text-align: center; }
.add-pic .pic{ width: 160px; height: 160px; overflow: hidden; position: relative;}
.add-pic .inp-flie-btn,.add-pic .img{ width: 100%; height: 100%; position: absolute; left: 0; top: 0;}
.add-pic .inp-flie-btn{ opacity: 0; z-index: 1;}
.add-pic .ti{ line-height: 30px;}
.pic-list{ width: auto; padding: 20px;}
.pic-list img{ margin: 10px;}
</style>
</head>
<body>
<div class="add-pic">
<div class="pic">
<img src="imgs/add-pic-btn.png" class="img" id="add-pic-img" alt="">
<input type="file" accept="image/*" multiple class="inp-flie-btn" id="add-pic-btn">
</div>
<p class="ti">上传多张图片</p>
</div>
<div class="pic-list">
</div>
<!--上传多张图片:单击按钮上传，图片渲染到pic-list-->
<script>
let file_input=document.getElementById("add-pic-btn");
// 触发事件用的是change，因为files是数组，需要添加下标
file_input.addEventListener("change",function(){
let obj = this,
obj_name=obj.files[0].name,
img_length=obj.files.length;
for(let i=0; i<img_length; i++){
if(!(/image\/\w+/).test(obj.files[i].type))
{
alert("上传的图片格式错误，请上传图片");
return false;
}
let reader = new FileReader();
reader.error=function(e){
alert("读取异常")
}
reader.onload = function(e){
// 创建div_html是包括图片和图片名称的容器
let img_html='<img src="'+e.target.result+'"/>',
div_html=document.createElement("div");
if(document.getElementsByClassName("pic-list")[0].children.length<5) {
div_html.innerHTML=img_html;
div_html.className="img-div";
document.getElementsByClassName("pic-list")[0].appendChild(div_html);
}else{
alert("最多上传5张图片")
}
};
reader.onloadstart=function(){
console.log("开始读取"+obj_name); //这里有个bug，就是获取图片的名字都是以第一张命名
}
reader.onprogress=function(e){
if(e.lengthComputable){
console.log("正在读取文件")
}
};
reader.readAsDataURL(obj.files[i]);
}
})
</script>
</body>
</html>