JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.angularjs.org/angular-1.0.0rc4.min.js"></script>
<div ng-app>
    <div ng-controller="Ctrl">
        ng-bind-html: <span ng-bind-html="m.a.b"></span>
        <br/>
        ng-bind: <span ng-bind="m.a.b"></span>
        <br/>
        placeholder: <span>{{m.a.b}}</span>
        <br/>
        <button ng-click="del()">Delete</button>
    </div>
</div>

JavaScript

function M() {
    this.a = { b: '111' };
}

function Ctrl($scope) {
    $scope.m = new M();
    $scope.del = function() {
        this.m.a.b = '';
        // or this.m.a = {};  
    };
}