Angular材料的新手，并使用零食栏和对话框组件
我遇到的问题是当打开小吃店时，它首先出现在屏幕的中央，然后消失，然后从底部向上滑动。
还有其他人遇到过这个问题吗？
以下是我的package.json
中的依赖项 "dependencies": {
"@agm/core": "^1.0.0-beta.0",
"@angular/animations": "^5.0.0",
"@angular/cdk": "^5.0.0-rc.3",
"@angular/common": "^5.0.0",
"@angular/compiler": "^5.0.0",
"@angular/compiler-cli": "^5.0.0",
"@angular/core": "^5.0.0",
"@angular/forms": "^5.0.0",
"@angular/http": "^5.0.0",
"@angular/material": "^5.0.0-rc.3",
"@angular/platform-browser": "^5.0.0",
"@angular/platform-browser-dynamic": "^5.0.0",
"@angular/platform-server": "^5.0.0",
"@angular/router": "^5.0.0",
"@angular/upgrade": "^5.0.0",
"@ng-bootstrap/ng-bootstrap": "^1.0.0-beta.8",
"@types/html2canvas": "0.5.32",
"angular-maps": "^0.7.1",
"angular2-moment": "^1.7.0",
"bcrypt": "^1.0.2",
"bignumber.js": "^5.0.0",
"body-parser": "^1.17.2",
"chalk": "^2.3.0",
"contract-deployer": "^1.0.1",
"cors": "^2.8.4",
"eth-lib": "^0.2.5",
"ethjs-unit": "^0.1.6",
"express": "^4.15.3",
"express-validation": "^1.0.2",
"hammerjs": "^2.0.8",
"hbs": "~3.1.0",
"helmet": "^3.9.0",
"html2canvas": "^0.5.0-beta4",
"ipfs-api": "^14.0.3",
"joi": "^13.0.2",
"jquery": "^3.2.1",
"jshint-loader": "^0.8.4",
"json2csv": "^3.11.5",
"jsonwebtoken": "^7.4.1",
"lodash": "^4.17.4",
"moment": "^2.18.1",
"mongo-querystring": "^4.1.1",
"mongodb": "^2.2.28",
"mongoose": "^4.10.5",
"ng2-nvd3": "^2.0.0",
"nouislider": "^10.0.0",
"oboe": "^2.1.4",
"owl.carousel": "^2.2.0",
"ramda": "^0.25.0",
"randomhex": "^0.1.5",
"request": "^2.83.0",
"scrypt.js": "^0.2.0",
"serve-favicon": "^2.4.3",
"solc": "^0.4.11",
"swarm-js": "^0.1.37",
"validator": "^7.2.0",
"websocket": "^1.0.25",
"winston": "^2.4.0"
}