要在不同的元素上绑定html 如何实现

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window.onload=function(){ var viewModel = {
details: ko.observable();

};
var viewmodel={ app:ko.observable(); }; viewModel.details("<em>For further details, view the report <a href='report.html'>here</a>.</em>"); viewModel.app("<span>前端工程师</span>"); ko.applyBindings(viewModel); ko.applyBindings(viewmodel); }