js實現上傳圖片預覽功能思路是獲取上傳圖片本地路徑，再載入到頁面中實現上傳預覽
HTML程式碼

<div class="upload">
        <input type="button" class="btn" onclick="browerfile.click()" value="上傳">
        <input type="file" id="browerfile" style="display: none;" class="test">
        <div class="img_center">
            <img src=""
 
 class="img1-img">
        </div>
    </div>

實現功能的js程式碼

//獲取圖片路勁的方法，相容多種瀏覽器，通過createObjectURL實現
function getObjectURL(file){
    var url = null;
    if(window.createObjectURL != undefined){
        url = window.createObjectURL(file);//basic
    }else if(window.URL != undefined){
        url = window.URL.createObjectURL(file);
    }else
 
 if(window.webkitURL != undefined){
        url = window.webkitURL.createObjectURL(file);
    }

    return url;
}

//實現功能程式碼
$(function(){
    $("#browerfile").change(function(){
        var path = browerfile.value;
        var objUrl = getObjectURL(this.files[0]);
        if(objUrl){
            $('.img1-img'
 
).attr("src",objUrl);
        }
    })
})