Solution:

1. Add document.domain = 'root domain name' in ueditordialogsinternal.js;

2. Also specify the root domain name on the current page:

<script type="text/javascript">
    document.domain = "根域名";
</script>

This is no problem under chrome and firefox, but under IE you still need to simply modify the UEditor, find it in editor.js:

this._setup(container.firstChild.contentWindow.document);

Add the following code above it:

if (ie) {
    document.getElementById('baidu_editor_' + this.uid).src = "javascript:(function(){document.open();document.domain='"+document.domain+"';document.close();})()";
}

Next find:

me.document = doc;

Add below it:

me.document.domain='Root domain name';

This has solved the problem of UEditor cross-domain image transfer. I hope it will be helpful to everyone.

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