无法自定义图片背景
在选择文件作为背景时，无法正确的使用背景，代码出现一堆红色字符（乱码？）
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data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABkAAAARLCAYAAADcVG9NAAAACXBIWXMAADXTAAA10wEMIUN3AAAAG3RFWHRTb2Z0d2FyZQBDZWxzeXMgU3R1ZGlvIFRvb2zBp+F8AAAgAElEQVR42uy9a7htR1km+taYc619y4XshOwkOwEEPF4aGjxP24jtFQ5C+zzeEFC8ICByv4RAQgjITQREFNqWQys0emg92sfuVlC0bfBylPbY3XIURW0Pd4SQ7GRnZ2cne6815xxV58cYNeqrqq9q1JhrrrXmnOv7nmSvOccclxpj1Kiq8b31vq+aTqcGSxLGmLU75l6e035cPwkJiXwopeTcJSQkJCRWou3ci2OvyzGWvZ+TPlhCQkLi4MQHP/hBvPyGGzGqNrG5sQkDwGgDrTWm0wnqum76hrizKOlQ2m3bdbtNVL6/UYqsqgAo1HWNWb2F5z3/x/CiF70Ihw4d2vG5uzSYCZbx341p/m
后面太长了