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base64多图片上传如何和后台进行交互

张子豪 2025-10-11 12:23 1

base64多图上传到后台

东西/原料

sublime
thinkphp

方式/步调

1
起首建立html页面：

<div class="container">
            <label>请选择一个图像文件：</label>
            <button style="display:none;" id="select">(从头)选择图片</button>
            <button id="add">选择上传图片</button>
            <input type="file" id="file_input" multiple/> 
            <button id="submit">提交</button>
        </div>
2
<style type="text/css">
    .float{
        float:left;
        width : 200px;
        height: 200px;
         overflow: hidden;
        border: 1px solid #CCCCCC;
         border-radius: 10px;
        padding: 5px;
        margin: 5px;
     }
    img{
        position: relative;
     }
    .result{
        width: 200px;
        height: 200px;
         text-align: center;
        box-sizing: border-box;
     }
    #file_input{
        display: none;
    }
</style>
3
window.onload = function(){
    var input = document.getElementById("file_input");
    var result;
    var dataArr = []; // 储存所选图片的成果(文件名和base64数据)
    var fd; //FormData体例发送请求
    var oSelect = document.getElementById("select");
    var oAdd = document.getElementById("add");
    var oSubmit = document.getElementById("submit");
    var oInput = document.getElementById("file_input");
    if(typeof FileReader==='undefined'){
        alert("抱愧，你的浏览器不撑持 FileReader");
        input.setAttribute('disabled','disabled');
    }else{
        input.addEventListener('change',readFile,false);
    }
    function readFile(){
        fd = new FormData();
           var iLen = this.files.length;
        var index = 0;
        for(var i=0;i<iLen;i++){
            if (!input['value'].match(/.jpg|.gif|.png|.jpeg|.bmp/i)){　　//判定上传文件格局
                return alert("上传的图片格局不准确，请从头选择");
            }
            var reader = new FileReader();
            reader.index = i;
            fd.append(i,this.files[i]);
            reader.readAsDataURL(this.files[i]); //转当作base64
               reader.onload = function(e){
                 var imgMsg = this.result ;
                dataArr.push(imgMsg);
                result = '<div class="result"><img src="'+this.result+'" alt=""/></div>';
                var div = document.createElement('div');
                div.innerHTML = result;
                div['className'] = 'float';
                div['index'] = index;
                document.getElementsByTagName('body')[0].appendChild(div); 　　//插入dom树
                var img = div.getElementsByTagName('img')[0];
                img.onload = function(){
                    var nowHeight = ReSizePic(this); //设置图片巨细
                    this.parentNode.style.display = 'block';
                    var oParent = this.parentNode;
                    if(nowHeight){
                        oParent.style.paddingTop = (oParent.offsetHeight - nowHeight)/2 + 'px';
                    }
                }
                index++;
            }
        }
    }
    function send(){
        var submitArr = [];
        for (var i = 0; i < dataArr.length; i++) {
            if (dataArr[i]) {
                submitArr.push(dataArr[i]);
            }
        }
        $.ajax({
            url : '/home/test/upload',
            type : 'post',
            data : {"image":dataArr},
            dataType: 'json',
             success : function(data){
                if (data == 1) {
                    alert("图片上传当作功");
                }else{
                    alert("图片上传掉败");
                }
          　}
        })
    }
    oSelect.onclick=function(){
        oInput.value = "";   // 先将oInput值清空，不然选择图片与前次不异时change事务不会触发
        $('.float').remove(); //清空已选图片
        dataArr = [];
         index = 0;
             oInput.click();
    }
    oAdd.onclick=function(){
        oInput.value = "";   // 先将oInput值清空，不然选择图片与前次不异时change事务不会触发
        oInput.click();
    }
    oSubmit.onclick=function(){
         if(!dataArr.length){
            return alert('请先选择文件');
        }
        send();
    }
}
4
function ReSizePic(ThisPic) {
    var RePicWidth = 200; //这里点窜为您想显示的宽度值
          var TrueWidth = ThisPic.width; //图片现实宽度
    var TrueHeight = ThisPic.height; //图片现实高度
        if(TrueWidth>TrueHeight){
        var reWidth = RePicWidth;//广大于高
        ThisPic.width = reWidth;
        var nowHeight = TrueHeight * (reWidth/TrueWidth); //垂直居中
         return nowHeight; //将图片点窜后的高度返回，供垂直居顶用
    }else{
         var reHeight = RePicWidth; //宽小于高
         ThisPic.height = reHeight;
    }
}
5
后台数据处置：
public function upload(){
        foreach ($_POST['image'] as $key => $value) {
            $up_dir = './upload/';//存放在当前目次的upload文件夹下
            if (!file_exists($up_dir)) {
                mkdir($up_dir,0777);
            }
            if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $value,$result)) {
                $type = $result[2];
                if (in_array($type,array('pjpeg','jpeg','jpg','gif','bmp','png'))) {
                    $new_file = $up_dir.date('YmdHis_').rand(10000,99999).'.'.$type;
                    if (file_put_contents($new_file, base64_decode(str_replace($result[1],'',$value)))) {
                        $img_path = str_replace('../../..', '', $new_file);
                        $re[] += 1;
                    }else{
                        $re[] += 0;
                    }
                }else{
                    $re[] += 0;
                }
            }else{
                $re[] += 0;
                    }
        }
        if (count($re) == count($_POST['image'])) {
            echo 1;
        }else{
            echo 0;
        }
    }