SAP often put 3rd JavaScript libraries at \resources\sap\ui\thirdparty, then load as below:
jQuery.sap.require("sap/ui/thirdparty/d3");
样例：
OpenUI5: D3.js based custom control and table
Custom SAPUI5 Visualization Controls with D3.js
SAP often put 3rd JavaScript libraries at \resources\sap\ui\thirdparty, then load as below:
jQuery.sap.require("sap/ui/thirdparty/d3");
样例：
OpenUI5: D3.js based custom control and table
Custom SAPUI5 Visualization Controls with D3.js