这个样的数结构字符串是怎么递归出来的[{"cls":"folder","id":10,"leaf":false,checked:false,"children":[{"cls":"file","id":11,"leaf":true,checked:false,"children":null,"text":"S600"},{"cls":"file","id":12,"leaf":true,checked:false,"children":null,"text":"SLK200"}],"text":"Benz"}]
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