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ee.Filter.stringStartsWith
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创建一个一元或二元过滤器，如果左操作数（字符串）以右操作数（也是字符串）开头，则通过该过滤器。
| 用法 | 返回 |
|---|
ee.Filter.stringStartsWith(leftField, rightValue, rightField, leftValue) | 过滤 |
| 参数 | 类型 | 详细信息 |
|---|
leftField | 字符串，默认值：null | 左操作数的选择器。如果指定了 leftValue，则不应指定此参数。 |
rightValue | 对象，默认值：null | 右操作数的值。如果指定了 rightField，则不应指定此字段。 |
rightField | 字符串，默认值：null | 用于选择右操作数的选择器。如果指定了 rightValue，则不应指定此参数。 |
leftValue | 对象，默认值：null | 左操作数的值。如果指定了 leftField，则不应指定此字段。 |
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最后更新时间 (UTC)：2025-07-26。
[null,null,["最后更新时间 (UTC)：2025-07-26。"],[[["\u003cp\u003eCreates a filter that checks if a string (left operand) starts with another string (right operand).\u003c/p\u003e\n"],["\u003cp\u003eAccepts either a field or a direct value for both the left and right operands, but not both for the same operand.\u003c/p\u003e\n"],["\u003cp\u003eThe filter passes if the left operand string starts with the right operand string.\u003c/p\u003e\n"],["\u003cp\u003eUseful for selecting features or images based on string properties like file names or IDs.\u003c/p\u003e\n"]]],["This creates a filter to check if a string (left operand) begins with another string (right operand). It's configured using `ee.Filter.stringStartsWith`. You define either the field names (`leftField`, `rightField`) or the values (`leftValue`, `rightValue`) for both operands. The filter returns `True` when the left string starts with the right, enabling data subset selection. This can be used as a unary or binary filter.\n"],null,["# ee.Filter.stringStartsWith\n\nCreates a unary or binary filter that passes if the left operand, a string, starts with the right operand, also a string.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-----------------------------------------------------------------------------------------------|---------|\n| `ee.Filter.stringStartsWith(`*leftField* `, `*rightValue* `, `*rightField* `, `*leftValue*`)` | Filter |\n\n| Argument | Type | Details |\n|--------------|-----------------------|---------------------------------------------------------------------------------------|\n| `leftField` | String, default: null | A selector for the left operand. Should not be specified if leftValue is specified. |\n| `rightValue` | Object, default: null | The value of the right operand. Should not be specified if rightField is specified. |\n| `rightField` | String, default: null | A selector for the right operand. Should not be specified if rightValue is specified. |\n| `leftValue` | Object, default: null | The value of the left operand. Should not be specified if leftField is specified. |"]]
