回答編集履歴
1
調整
answer
CHANGED
|
@@ -4,4 +4,37 @@
|
|
|
4
4
|
<div id="img">
|
|
5
5
|
<!--ここに画像をいれる-->
|
|
6
6
|
</div>
|
|
7
|
+
```
|
|
8
|
+
|
|
9
|
+
# 参考
|
|
10
|
+
```javacscript
|
|
11
|
+
<script>
|
|
12
|
+
window.addEventListener('DOMContentLoaded', ()=>{
|
|
13
|
+
document.querySelector('#up').addEventListener('change',e=>{
|
|
14
|
+
var target=e.target;
|
|
15
|
+
var file=target.files[0];
|
|
16
|
+
if(file !==undefined){
|
|
17
|
+
var fr = new FileReader();
|
|
18
|
+
fr.addEventListener('load',e=>{
|
|
19
|
+
var type=file.type;
|
|
20
|
+
if(["image/jpeg","image/gif","image/png"].indexOf(type)>-1){
|
|
21
|
+
var blob=new Blob([e.target.result],{type});
|
|
22
|
+
var binary=String.fromCharCode.apply("",new Uint8Array(e.target.result));
|
|
23
|
+
var base64="data:"+file.type+";base64,"+btoa(binary);
|
|
24
|
+
var img=Object.assign(document.createElement('img'),{src:base64});
|
|
25
|
+
Object.assign(document.querySelector('#img'),{textContent:""}).appendChild(img);
|
|
26
|
+
}else{
|
|
27
|
+
target.value="";
|
|
28
|
+
document.querySelector('#img').textContent="";
|
|
29
|
+
}
|
|
30
|
+
});
|
|
31
|
+
fr.readAsArrayBuffer(file);
|
|
32
|
+
}
|
|
33
|
+
});
|
|
34
|
+
});
|
|
35
|
+
</script>
|
|
36
|
+
<input type="file" value="up" id="up" accept="image/*">
|
|
37
|
+
<div id="img">
|
|
38
|
+
<!--ここに画像をいれる-->
|
|
39
|
+
</div>
|
|
7
40
|
```
|