补充 sting.substring示例

46b5cc3d · lizhongyi_ · 40ec3a6f · 46b5cc3d
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uni_modules/uts-tests/utssdk/String.uts uni_modules/uts-tests/utssdk/String.uts +3 -0

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--- a/uni_modules/uts-tests/utssdk/String.uts
+++ b/uni_modules/uts-tests/utssdk/String.uts
@@ -275,6 +275,9 @@ export function testString(): Result {
            expect(str2.substring(3, 8)).toEqual("lo wo");
            expect(str2.substring(0, -1)).toEqual("");
            expect(str2.substring(0, 20)).toEqual("hello world");
+			
+			var str3 = "aaa";
+			expect(str3.substring(10, 1)).toEqual("aa");
        })
        test("trim", () => {
            const greeting = '   Hello world!   ';