将call方法应用于其他对象上的几种方法

        function print_vars(var1,var2){
            console.log( var1 );
            console.log( var2 );
            console.log( this.name );
            console.log( this.age );
        }
        var o = {
            name:‘tester‘,
            age:16
        };
        print_vars.call( o,1,2);

var arr = {
            "0":1,
            "1":2,
            "2":3,
            length:3
        };
        //用数组实例的every方法应用在arr上
        var rst = [].every.call(arr,function(v,i,a){
            return v>0;
        });
        console.log( rst );

        var arr = {
            "0":1,
            "1":2,
            "2":3,
            length:3
        };
        var rst = Array.prototype.every.call( arr,function(v,i,a){
            return v>0;
        } );
        console.log( "rst:"+rst );