1.62打包ios黑屏

浏览器运行正常,放到服务器后微信也可以正常使用,打包ios后黑屏
2018-01-02 16:09:04.542095+0800 demo-mobile[2779:1808906] [DYMTLInitPlatform] platform initialization successful
2018-01-02 16:09:04.833596+0800 demo-mobile[2779:1808752] Metal GPU Frame Capture Enabled
2018-01-02 16:09:04.834474+0800 demo-mobile[2779:1808752] Metal API Validation Enabled

{
gl.supports_OES_map_buffer: true
gl.supports_vertex_array_object: true
cocos2d.x.version: 1.6.1
gl.vendor: Apple Inc.
gl.supports_PVRTC: true
gl.renderer: Apple A9 GPU
cocos2d.x.compiled_with_profiler: false
gl.version: OpenGL ES 2.0 Metal - 50.8
gl.max_texture_size: 4096
gl.supports_ETC1: false
gl.supports_BGRA8888: false
cocos2d.x.build_type: DEBUG
gl.max_texture_units: 8
gl.max_samples_allowed: 4
gl.supports_OES_packed_depth_stencil: true
gl.supports_NPOT: true
gl.supports_discard_framebuffer: true
cocos2d.x.compiled_with_gl_state_cache: true
gl.supports_OES_depth24: true
}

Cocos2d-x-lite v1.6.0
2018-01-02 16:09:05.463819+0800 demo-mobile[2779:1808752] refreshPreferences: HangTracerEnabled: 0
2018-01-02 16:09:05.463872+0800 demo-mobile[2779:1808752] refreshPreferences: HangTracerDuration: 500
2018-01-02 16:09:05.463918+0800 demo-mobile[2779:1808752] refreshPreferences: ActivationLoggingEnabled: 0 ActivationLoggingTaskedOffByDA:0
2018-01-02 16:09:05.468547+0800 demo-mobile[2779:1808752] cocos2d: surface size: 2048x1536
Create unpacker 0b0c08db3 for ceF1CuJ3lLFouBjujeW4FN
2018-01-02 16:09:05.577074+0800 demo-mobile[2779:1808752] cocos2d: surface size: 2048x1536
LoadScene ceF1CuJ3lLFouBjujeW4FN: 136.663ms
I: 0.7999999999999545ms
AR: 0.03499999999996817ms
D: 0.022000000000048203ms
Success to load scene: db://assets/scenes/persist.fire
AP: 0.0039999999999054126ms
JS Exception: fetch is not defined, file: /Users/asdf/build/jsb-default/src/project.js, lineno: 1

Stack: require<.myNode</<.fetchGet@/Users/asdf/build/jsb-default/src/project.js:1:17072
require<.myNode</<.onLoad@/Users/asdf/build/jsb-default/src/project.js:1:18089
anonymous@/Users/asdf/build/jsb-default/src/jsb_polyfill.js line 1 > Function:1:63
[47]</p<.invoke@/Users/asdf/build/jsb-default/src/jsb_polyfill.js:1:141048
[113]</y<.activateNode@/Users/asdf/build/jsb-default/src/jsb_polyfill.js:1:330949
[24]</cc.Scene<._activate@/Users/asdf/build/jsb-default/src/jsb_polyfill.js:1:118987
[200]</<.runSceneImmediate@/Users/asdf/build/jsb-default/src/jsb_polyfill.js:1:593842
[200]</<._loadSceneByUuid/<@/Users/asdf/build/jsb-default/src/jsb_polyfill.js:1:595903
[135]</v.loadAsset/<@/Users/asdf/build/jsb-default/src/jsb_polyfill.js:1:371161
[98]</b.load/u</<@/Users/asdf/build/jsb-default/src/jsb_polyfill.js:1:303206
[156]</n.exports.callInNextTick/<@/Users/asdf/build/jsb-default/src/jsb_polyfill.js:1:430185
[84]</l.once/r@/Users/asdf/build/jsb-default/src/jsb_polyfill.js:1:263077
[83]</r.prototype.invoke@/Users/asdf/build/jsb-default/src/jsb_polyfill.js:1:260699
[84]</l.emit@/Users/asdf/build/jsb-default/src/jsb_polyfill.js:1:263527
[200]</cc.Director._beforeUpdateListener.callback@/Users/asdf/build/jsb-default/src/jsb_polyfill.js:1:597088

不知道什么原因,这种情况应该怎么查错?求解答,谢谢