let source ='../../images/bg.png'

 var texture = textureLoader.load('../../images/bg.png');    

    var geometry = new THREE.PlaneGeometry( rangeSize, rangeSize/2, 1);

    var material = new THREE.MeshBasicMaterial( {side: THREE.DoubleSide} );

    var plane3 = new THREE.Mesh( geometry, material );

    group.add( plane3 );

source是本地路径图片时。可以正常显示纹理，如果换成DataURI 在开发工具上正常显示。真机不显示；