angular httpParams的问题

Question

跪求大神帮忙解决一下啊，，

Answer 1

The HttpParams are immutable。意思是说 append 操作不会修改原来的 sum ，append 操作返回一个新的 HttpParams 实例，这个新实例带着你 append 的数据，旧实例不会改变。sum = sum.append('one', 'first'); sum = sum.append('two', 'second'); sum = sum.append('three', 'third');or sum = sum.append('one', 'first').append('two', 'second').append('3', '3d');

Answer 2

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Answer 3

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